diff --git a/anesthetic/samples.py b/anesthetic/samples.py
index 2c7856e7..96782993 100644
--- a/anesthetic/samples.py
+++ b/anesthetic/samples.py
@@ -1532,7 +1532,7 @@ def points_to_plot(self, plot_type, label, evolution, beta, base_color):
             assert len(colors) == len(samples)
             return samples, colors
         else:
-            raise ValueError("Unreachable code")
+            raise ValueError("plot_type not supported")
 
 
 def merge_nested_samples(runs):
diff --git a/tests/example_data/dnest4_no_column_names/README.md b/tests/example_data/dnest4_no_column_names/README.md
new file mode 100644
index 00000000..6c12769e
--- /dev/null
+++ b/tests/example_data/dnest4_no_column_names/README.md
@@ -0,0 +1,2 @@
+these results are generated with https://github.com/modsim/DNest4/tree/master/code/Examples/Gaussian.
+
diff --git a/tests/example_data/dnest4_no_column_names/levels.txt b/tests/example_data/dnest4_no_column_names/levels.txt
new file mode 100644
index 00000000..56d2d4eb
--- /dev/null
+++ b/tests/example_data/dnest4_no_column_names/levels.txt
@@ -0,0 +1,11 @@
+# log_X, log_likelihood, tiebreaker, accepts, tries, exceeds, visits
+0 -1.79769313486e+308 0 499346 499346 166854 453294
+-0.999571251226 -24.3597681926 0.7551917793 313532 499489 233539 634669
+-1.99937472226 -9.57025215661 0.30892651978 222714 499379 258897 701329
+-2.99655592479 -4.10851011468 0.747675734387 163810 499544 269353 726821
+-3.99052132804 -2.1019896864 0.580542049043 123570 499663 268259 737400
+-4.99971625378 -1.34948959349 0.334456726091 93858 499452 278699 736105
+-5.97598204066 -1.08113616536 0.37597039172 73553 499402 286086 746493
+-6.94210606655 -0.981723001433 0.187966007139 59145 499757 287358 754237
+-7.91306613861 -0.942917930815 0.636052448636 47833 500250 281009 755998
+-8.90450040925 -0.927947382774 0.65807456864 39827 499770 0 0
diff --git a/tests/example_data/dnest4_no_column_names/sample.txt b/tests/example_data/dnest4_no_column_names/sample.txt
new file mode 100644
index 00000000..c6c19b59
--- /dev/null
+++ b/tests/example_data/dnest4_no_column_names/sample.txt
@@ -0,0 +1,501 @@
+# Samples
+8.03794 -7.39097 
+-0.912144 5.38768 
+4.66925 1.31299 
+2.37219 7.2351 
+-8.55207 6.1829 
+-5.09315 5.76313 
+-1.64683 0.102338 
+6.0112 8.57318 
+1.41464 5.29773 
+-7.9423 2.2053 
+2.71119 2.1424 
+2.60122 -5.67186 
+-0.987966 -1.72323 
+-3.13403 -1.43698 
+1.85364 3.69236 
+-2.1157 -0.526436 
+1.40263 -1.2391 
+-1.74545 3.2969 
+7.0698 -4.55994 
+-1.19373 3.70517 
+-2.22755 -2.45388 
+-2.2056 7.15416 
+-5.58894 0.216229 
+1.73818 -5.27126 
+1.44644 -0.405415 
+3.65389 4.66652 
+-2.09614 -0.923006 
+0.00746782 1.77172 
+-3.2048 -4.46059 
+-3.78657 -4.7606 
+-4.68305 -2.58252 
+0.911312 -0.125518 
+-1.73495 0.733095 
+0.0724071 -0.0727894 
+-0.311725 1.64431 
+-0.550049 -0.25155 
+4.82072 -8.91082 
+-1.73416 1.60688 
+-0.913441 0.233414 
+1.30074 0.95124 
+-1.51261 1.19256 
+-0.184535 1.17888 
+-0.870689 9.68111 
+-0.0409561 -0.376015 
+0.444242 0.130658 
+0.531607 -0.305932 
+-0.6751 0.296506 
+0.940503 -0.831824 
+0.300654 0.670442 
+-1.58131 -6.73887 
+-0.52343 -0.0846465 
+-0.0441512 -0.56099 
+-0.869533 0.289608 
+6.10736 -2.635 
+0.184704 -0.0220027 
+0.0391038 0.139203 
+-0.0828206 0.174906 
+1.25084 -0.878427 
+-0.417159 -0.781976 
+-0.232499 -0.0285052 
+0.0613684 0.321801 
+0.893465 0.990848 
+0.0217515 0.0581149 
+0.20664 0.345644 
+0.136433 0.153445 
+0.323769 0.300635 
+0.0142056 0.0288957 
+2.80084 -2.86125 
+1.64245 1.96857 
+0.404372 -0.000185558 
+-0.0683598 0.0301628 
+0.131302 0.0245166 
+-1.64853 1.49003 
+-0.185954 0.0747238 
+1.81075 0.264987 
+0.0543962 0.0447508 
+-0.0785556 -0.0864432 
+0.0594714 -0.109282 
+0.0243821 0.0373721 
+-0.167722 0.13925 
+0.143885 0.125953 
+0.165225 0.0806737 
+-0.211201 0.184162 
+-0.0749809 0.200478 
+-0.059028 -0.0747701 
+-0.0471153 -0.207288 
+0.114622 0.00992726 
+-0.180419 0.226334 
+0.154585 -0.0621936 
+-0.0181339 0.405968 
+-0.198278 0.00120902 
+0.411796 0.0746577 
+-0.15485 -0.234035 
+-0.0878203 0.252429 
+0.160155 -0.303235 
+-0.155426 0.0301761 
+0.328359 -0.81662 
+-0.0131696 0.171867 
+-0.0786487 -0.108208 
+-0.415118 0.598318 
+0.208398 -0.0126049 
+0.762627 0.913426 
+0.349983 -0.753459 
+-0.0230784 0.0415432 
+0.0932482 -0.421742 
+-0.0402393 0.181441 
+0.208792 0.437349 
+-0.495821 -0.122168 
+-0.13721 -0.136055 
+-0.368105 0.0815949 
+0.251496 0.235754 
+0.333652 -0.213718 
+-0.244392 0.0989661 
+0.0257419 -0.00665218 
+0.305172 0.163802 
+-0.307581 1.50203 
+0.0722119 0.0544439 
+0.414663 0.310891 
+-0.655573 0.456649 
+-0.0340741 0.0105878 
+0.201916 0.0127907 
+-1.17816 1.06551 
+0.181519 -0.0915563 
+0.880007 0.0204517 
+-0.265841 0.172853 
+-1.46249 -0.0924284 
+0.713514 -0.338247 
+-0.0941108 -0.0387444 
+-2.08646 -1.10906 
+-0.221931 -0.236216 
+0.906956 -0.795073 
+0.536073 0.0944006 
+0.27494 -0.0103615 
+-1.02738 -2.11432 
+-0.117434 0.179359 
+-3.85916 -1.31649 
+-0.0236414 -0.102298 
+-0.0794356 0.107151 
+-0.134688 0.495166 
+0.113612 0.160056 
+-0.0192828 -0.172059 
+0.584027 -0.838366 
+-0.95889 0.873347 
+-2.08817 -0.590688 
+-1.72506 2.21559 
+0.194077 -0.190225 
+0.0531061 -0.0151408 
+0.0145362 -0.195997 
+-0.0850781 0.025403 
+-0.439441 0.160864 
+0.00579554 0.0821378 
+-0.19327 2.21563 
+-0.284469 -0.882918 
+0.263409 -0.0807555 
+0.302795 -1.25159 
+-0.302185 0.611021 
+0.0267082 0.122378 
+0.223968 0.319894 
+-0.0385921 -0.318653 
+1.3647 -0.840047 
+0.133923 0.125661 
+-0.0248534 -0.0885972 
+0.11058 0.335069 
+0.259387 0.0671344 
+2.75747 2.9312 
+0.756501 -3.64119 
+-0.075712 0.247553 
+0.496973 0.0985056 
+-0.363256 2.48079 
+-4.49627 -4.87249 
+0.494436 1.40064 
+-0.0600697 -0.251812 
+-0.0296497 0.112911 
+-0.285603 2.82018 
+-0.386575 0.414226 
+0.69675 -1.88073 
+-0.276685 -0.540402 
+-0.144703 0.147367 
+1.52968 1.62579 
+0.105533 -0.0615409 
+0.188348 -0.00476516 
+-0.0252626 0.103882 
+-0.597808 -0.627459 
+-0.930869 -2.42865 
+-2.66388 4.10675 
+0.0762657 0.0416691 
+0.00888775 0.00472379 
+0.0939913 0.0539106 
+-0.166039 0.0435287 
+0.320158 0.000342884 
+2.21697 0.730647 
+0.370732 0.277159 
+1.32707 -4.80705 
+0.365837 -0.135911 
+-1.58492 4.8846 
+-1.22328 -2.57919 
+0.126862 -0.00221921 
+-0.238083 0.133255 
+-1.79598 3.88943 
+-0.0624638 -0.121789 
+-0.241188 -1.4591 
+0.1692 0.189777 
+0.063135 -2.072 
+0.559592 3.38038 
+0.748949 0.316674 
+-0.0337725 -0.128362 
+0.235978 -0.145948 
+-2.66685 3.43787 
+-0.112935 -0.271273 
+-0.109228 -0.578612 
+2.73105 -0.872041 
+-0.442756 0.00459232 
+0.770044 -0.973096 
+-0.510967 0.433871 
+0.0755387 -0.178821 
+-6.0471 -2.36745 
+-0.0878818 0.0328222 
+-0.213359 -2.08098 
+5.50861 -6.50998 
+0.215291 -0.794202 
+0.161985 -0.468996 
+-1.32334 -1.37641 
+0.962004 2.09874 
+-0.0550268 -0.0956795 
+0.05554 -0.0851617 
+9.96667 -8.10034 
+0.478364 3.98805 
+-0.0482955 0.211809 
+1.97838 -3.00168 
+-0.0600626 -0.0157672 
+-1.06215 -3.44153 
+-1.82365 7.18523 
+-5.60635 -3.44062 
+0.0810786 -0.10985 
+-0.299902 -0.444535 
+0.176782 0.0651168 
+-3.32255 -4.00147 
+0.282267 0.00119473 
+0.392705 0.776282 
+0.730131 0.0230857 
+-1.75728 -1.11044 
+-0.0416547 0.017395 
+6.37034 -7.24367 
+0.0654329 0.0854995 
+1.43119 -0.51535 
+-0.119246 0.0150497 
+6.96687 -8.57767 
+0.443444 0.0737704 
+2.01559 5.39161 
+-0.0523691 -0.0547722 
+-0.338157 0.278335 
+-0.069592 -0.191419 
+0.121522 -0.0566927 
+1.68177 -4.34886 
+5.72386 -7.75799 
+-0.083421 -0.126576 
+1.21395 1.84709 
+0.193959 0.0686935 
+-0.565981 -2.89325 
+-0.159025 0.575324 
+-0.0951585 0.0134939 
+-0.13504 -0.11592 
+0.304903 -0.333094 
+0.0499899 0.288547 
+-0.0406184 0.0878493 
+0.028301 0.064352 
+0.0319724 0.583167 
+-0.166566 0.0330138 
+-0.533469 -0.346965 
+0.0453271 -0.0298608 
+-3.41092 0.0618885 
+0.277132 -0.0774003 
+2.34867 -0.275611 
+0.285389 0.695068 
+-1.31621 0.617278 
+-0.985036 1.03422 
+0.518031 -0.5429 
+1.57478 -3.13752 
+-7.49018 -6.85626 
+9.338 8.33267 
+0.0850537 -0.00461704 
+1.01462 0.174994 
+0.0377684 -0.380715 
+0.547711 0.511635 
+-0.09153 0.323862 
+-4.48814 4.35976 
+0.78707 -2.16814 
+-0.79552 0.261358 
+-0.0743035 0.10192 
+-0.408268 -0.555486 
+-4.90871 2.28319 
+2.32139 -0.601018 
+0.0164628 -0.00302241 
+0.133384 -2.08091 
+-0.0151785 0.10836 
+0.0742228 0.025238 
+0.135743 0.278023 
+0.037886 0.0591829 
+-0.570705 -0.275555 
+0.799646 0.214671 
+1.40979 -0.548834 
+-1.05449 0.199902 
+0.129292 0.036271 
+0.110874 -0.322102 
+-0.890455 3.10051 
+0.0870546 0.173189 
+-1.20673 4.6463 
+0.265288 0.376799 
+0.527784 -0.143991 
+-0.818062 -0.00498385 
+0.534174 0.227369 
+0.370659 0.34367 
+-0.094777 0.0725935 
+4.49664 -1.40788 
+-0.011936 -0.0841135 
+-0.0988636 0.548419 
+-0.093384 -0.180969 
+1.35125 -4.08132 
+0.183985 0.105915 
+0.0483288 0.188675 
+-0.947887 1.3507 
+-0.162837 -1.14195 
+-0.37708 -0.187524 
+-0.00537339 0.00951453 
+0.47108 2.08262 
+-2.30354 0.490303 
+0.0250569 0.0600914 
+-0.0240117 -0.179659 
+-0.171628 -0.149332 
+6.24798 5.78298 
+0.513927 -2.20175 
+0.32961 -0.284068 
+-0.242566 -0.204439 
+7.91516 0.457227 
+-5.53762 3.87623 
+2.33822 0.519627 
+-0.197423 -0.0787608 
+-0.0353173 0.0298961 
+0.773661 -0.240707 
+-0.106404 -0.0722508 
+4.23689 -2.98416 
+-2.48564 0.459338 
+-0.0845158 0.0166896 
+1.19059 1.66287 
+1.71682 1.16451 
+-1.21814 -1.69079 
+-0.00668665 -0.0515079 
+-6.3226 -0.615926 
+0.0445624 -0.568877 
+-0.817005 1.03856 
+-0.856749 -0.224063 
+2.10002 -2.82048 
+-0.45063 0.776198 
+-0.0206332 -0.268005 
+7.38739 7.66345 
+-0.0235418 0.000929562 
+-0.102955 0.0811018 
+-0.122859 0.176116 
+2.89471 -2.02694 
+2.57005 1.5551 
+-1.7104 3.40248 
+-0.0101287 -0.0532508 
+-5.75848 2.75182 
+1.16892 -1.2354 
+-1.07776 0.70332 
+0.248891 -0.129583 
+-0.932476 -0.267011 
+3.41738 -0.291878 
+-0.18869 0.252372 
+0.485805 -0.136165 
+0.111996 0.601006 
+1.46357 1.02059 
+0.0331881 0.180042 
+-2.87427 5.28223 
+0.289124 0.307465 
+-2.85702 6.13929 
+-2.49275 -0.28734 
+-0.122402 0.228404 
+-0.06224 0.058253 
+0.0692096 -0.380291 
+0.973474 -1.02369 
+-0.114509 -0.413532 
+-9.26564 5.24183 
+0.195998 -0.0658074 
+-0.0451743 -0.148958 
+0.0441777 -0.0122199 
+-1.74693 -3.93208 
+3.23835 -1.26037 
+1.47057 -0.317245 
+-0.00418691 -0.196712 
+4.00967 -9.12168 
+-3.36359 0.426643 
+1.39351 -1.74827 
+0.621123 -1.68012 
+0.437381 -0.63496 
+-0.056216 0.420735 
+1.8985 2.89611 
+0.315066 -0.682955 
+2.03797 0.922526 
+-1.65451 -1.82756 
+-0.283078 0.0094136 
+-9.28835 -2.83392 
+2.15781 -1.88389 
+-0.176717 -0.10896 
+-0.00085444 -0.0945958 
+9.04762 -3.3592 
+0.0417267 -0.353598 
+4.61248 -0.903447 
+0.136393 -0.087911 
+0.137087 0.0309051 
+3.09144 -5.57906 
+1.40089 -0.153516 
+-0.0779443 -0.0796471 
+0.150128 0.156495 
+-0.0298208 0.235943 
+0.0640115 -0.137946 
+-0.0849779 -0.0457488 
+-0.223199 0.262587 
+1.27893 3.58854 
+-8.8042 5.83303 
+-0.512432 1.05695 
+-0.361949 -0.0387996 
+0.448981 0.244442 
+0.207987 -2.77718 
+0.161838 0.550565 
+6.34975 4.97745 
+0.853955 3.48226 
+-0.84843 -0.603275 
+3.94127 -0.850769 
+0.0691365 0.367959 
+-1.37639 0.0726328 
+-2.46245 -4.48683 
+-0.451595 -1.38768 
+-1.17172 -1.32995 
+-2.7399 -2.18482 
+-0.12551 0.276762 
+0.560175 0.139471 
+1.76389 -1.56026 
+-0.472426 0.0780278 
+-0.287325 0.723597 
+0.389163 -0.0865347 
+0.0556664 -0.0102737 
+4.75288 -5.67401 
+0.174981 0.129244 
+0.417276 5.87513 
+1.73334 0.994502 
+0.841767 0.335397 
+0.600413 -8.84412 
+0.277896 0.973466 
+0.205 -0.0786201 
+-0.0410302 0.00121347 
+0.359201 0.288553 
+0.263219 0.169328 
+8.75187 -4.88059 
+-5.90821 3.40296 
+0.662988 0.293481 
+0.64869 -0.607988 
+0.320494 0.317864 
+5.2351 -0.707922 
+0.0885918 -0.00246283 
+0.106387 0.00103635 
+-0.404851 0.0824984 
+4.41172 -0.594112 
+0.0989245 0.0288895 
+6.27996 -1.02297 
+-0.859746 0.279207 
+-0.40774 -0.789246 
+1.56742 -1.7816 
+-0.526308 0.121361 
+-0.168126 1.34405 
+1.15642 -1.18135 
+-8.62991 -4.40907 
+-0.0921188 0.112798 
+0.0829416 -0.201453 
+-0.561514 0.0709943 
+0.0922257 0.0217377 
+0.0661021 0.0275164 
+-2.48048 -4.60922 
+0.615779 0.8356 
+3.5626 5.53445 
+-0.578104 -0.643057 
+0.0925839 0.450419 
+0.895399 -0.529587 
+-1.09705 1.74277 
+0.211289 -0.173931 
+0.0907058 -0.0936857 
+-5.36731 9.84087 
+-0.0662448 -0.0189288 
+-5.29812 -5.46996 
+6.05295 -4.68896 
+0.0453211 0.103823 
+-0.132501 0.122358 
+-0.00215165 -0.409102 
+-0.0129437 -0.176669 
+-2.00071 -0.288041 
+0.162822 0.112388 
+0.103757 -0.0599962 
+1.98943 -1.6846 
+0.0678944 -0.264965 
+-0.788367 -1.10343 
diff --git a/tests/example_data/dnest4_no_column_names/sample_info.txt b/tests/example_data/dnest4_no_column_names/sample_info.txt
new file mode 100644
index 00000000..94a75076
--- /dev/null
+++ b/tests/example_data/dnest4_no_column_names/sample_info.txt
@@ -0,0 +1,501 @@
+# level assignment, log likelihood, tiebreaker, ID.
+0 -60.5364140046 0.210245219273 5
+0 -15.8485004786 0.387092274494 9
+0 -12.6818456401 0.932802717954 18
+0 -29.9058961695 0.866019552441 0
+0 -56.601972961 0.486838478054 7
+0 -30.495888839 0.730970690816 17
+1 -2.28019323868 0.449525406556 5
+0 -55.73593085 0.340675525304 0
+1 -15.9525203742 0.152473767535 10
+0 -34.8906780874 0.282971863946 19
+1 -6.88913429724 0.983836703415 18
+1 -20.3870923945 0.0971420621419 14
+2 -2.89173963326 0.987709767869 0
+2 -6.86247841542 0.188368501854 10
+2 -9.45369331357 0.530786643039 5
+3 -3.29559907595 0.923614166867 10
+0 -2.67031249561 0.175710306714 14
+2 -7.87701529052 0.862841619025 2
+0 -36.3065233323 0.688409061617 2
+2 -8.49556037119 0.140403558995 15
+2 -6.41067526418 0.718421630555 6
+0 -28.9422901445 0.23103629447 19
+1 -16.5604669443 0.901205389436 2
+0 -16.3226678638 0.246114968242 11
+4 -2.0472144291 0.763743165289 10
+1 -18.4826071907 0.401975076738 0
+3 -3.5418183396 0.515203540501 5
+3 -2.48847027015 0.141052268902 13
+1 -16.0027526815 0.623384519579 18
+1 -19.4196466313 0.0808917206861 7
+1 -15.219125775 0.173093133642 5
+4 -1.34206095827 0.498097657612 6
+3 -2.69268178555 0.918120644081 17
+5 -0.924209081724 0.484742125348 6
+3 -2.31939521329 0.686457167606 3
+5 -1.1018543166 0.0408796265733 10
+0 -52.2399135665 0.253385302411 4
+3 -3.71362380963 0.43215661909 15
+4 -1.36336713995 0.547047978093 11
+3 -2.21733338111 0.888987953253 17
+2 -2.77403329801 0.606475200586 4
+3 -1.63084990555 0.0496250242949 3
+0 -48.1599690269 0.172493323942 3
+5 -0.990471027235 0.592830129725 5
+6 -1.02614975996 0.226411953619 12
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+0 -51.1266302493 0.955858722235 18
+1 -24.1624971436 0.102274850603 7
+5 -1.18178062968 0.00283122422647 0
+5 -1.31416268224 0.905097944755 4
+5 -1.02081565304 0.479061872211 7
+0 -14.872636969 0.161465914021 5
+9 -0.922865816623 0.651719331617 12
+9 -0.924598192785 0.287128702239 15
+6 -1.00429375221 0.919681679327 6
+1 -10.8270672877 0.556822550839 3
+8 -0.924248862033 0.0262172328983 11
+1 -21.1611010257 0.855367414703 16
+5 -1.32749842584 0.0311677716933 9
+5 -1.31351869938 0.811839067797 18
+3 -3.73440434317 0.166230796196 7
+4 -1.06480299791 0.916274373825 6
+4 -1.83630633858 0.866367726195 10
+3 -2.28539202 0.54500804813 11
+0 -47.8765928205 0.950999646464 16
+8 -0.929543192596 0.3547225443 2
+8 -0.942669928175 0.224741877416 18
+3 -1.07910783863 0.849940814141 4
+8 -0.923427587125 0.341990075187 13
+9 -0.921501848943 0.484645263551 19
+1 -14.6177755932 0.849846248622 11
+3 -1.45764444225 0.775209362663 15
+0 -22.5800691934 0.17106771151 11
+4 -1.29280125942 0.107427820804 16
+6 -1.02466318502 0.759782679209 19
+2 -1.46003880796 0.932420746737 3
+3 -3.03932830498 0.721832992587 13
+7 -0.956386070304 0.376006006907 8
+9 -0.927440808426 0.542273287161 11
+0 -63.7443297455 0.25835943176 10
+8 -0.921311869512 0.875574340419 5
+0 -29.9141669621 0.704280664723 14
+0 -30.2312108048 0.446712196228 18
+9 -0.92535514665 0.776941872307 2
+8 -0.935202497925 0.601785047755 14
+6 -1.00262291785 0.584741121797 7
+8 -0.934628281049 0.924029733668 9
+3 -2.96183644386 0.406198516834 2
+8 -0.938509658375 0.584607762673 18
+9 -0.926121091179 0.641859840519 13
+1 -4.31679174442 0.482378822315 9
+5 -0.956346666623 0.592314709237 3
+3 -1.83848038451 0.2289037001 11
diff --git a/tests/test_gui.py b/tests/test_gui.py
index a83d98a1..7b97b547 100644
--- a/tests/test_gui.py
+++ b/tests/test_gui.py
@@ -39,6 +39,10 @@ def test_gui(root):
     old = plotter.evolution()
     plotter.evolution.slider.set_val(5)
     assert plotter.evolution() != old
+    old = plotter.evolution()
+    plotter.evolution.slider.set_val(5.5)
+    assert plotter.evolution() != old
+    old = plotter.evolution()
     plotter.evolution.slider.set_val(0)
     assert plotter.evolution() == old
     plotter.type.buttons.set_active(1)
diff --git a/tests/test_reader.py b/tests/test_reader.py
index 268d8854..5e27a632 100644
--- a/tests/test_reader.py
+++ b/tests/test_reader.py
@@ -347,6 +347,37 @@ def test_read_dnest():
 
     assert_array_equal(ns.get_labels(), labels)
 
+
+    assert isinstance(ns, DiffusiveNestedSamples)
+    assert ns.samples_at_level(9, label='x1').shape == (45, 1)
+    assert ns.plot_types() == ('visited points',)
+
+    ns.points_to_plot('visited points', label='x1', evolution=0, beta=1, base_color='C0')
+
+    with pytest.raises(ValueError) as exc_info:
+        ns.points_to_plot('live', label='x1', evolution=0, beta=1, base_color='C0')
+    assert str(exc_info.value) == 'plot_type not supported'
+    with pytest.raises(ValueError) as exc_info:
+        ns.points_to_plot('posterior', label='x1', evolution=0, beta=1, base_color='C0')
+    assert str(exc_info.value) == 'plot_type not supported'
+    ns.plot_2d(['x0', 'x1'])
+    ns.plot_1d(['x0', 'x1'])
+
+
+def test_read_dnest4_no_column_names():
+    np.random.seed(3)
+    ns = read_dnest4('./tests/example_data/dnest4_no_column_names')
+    params = ['x0', 'x1', 'logL', 'logL_birth', 'nlive']
+    assert_array_equal(ns.drop_labels().columns, params)
+    labels = [r'$x0$',
+              r'$x1$',
+              r'$\ln\mathcal{L}$',
+              r'$\ln\mathcal{L}_\mathrm{birth}$',
+              r'$n_\mathrm{live}$']
+
+    assert_array_equal(ns.get_labels(), labels)
+
     assert isinstance(ns, DiffusiveNestedSamples)
+    assert ns.samples_at_level(9, label='x1').shape == (45, 1)
     ns.plot_2d(['x0', 'x1'])
     ns.plot_1d(['x0', 'x1'])