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Troubleshooting

The -m option doesn't produce a combined image.

Try typing which convert. If you have karma/kvis installed (common for viewing HI radio cubes), then it may return:
/usr/local/karma/bin/convert

If this is the case, you need to find where ImageMagick is installed. If you installed with Homebrew the path may be something like:
/usr/local/Cellar/imagemagick/7.1.0-13/bin/convert

To create the combined image, add the correct path after the -m option on the command line.

Minimum requirements for plotting HI contours on an optical image

Source catalog with the following properties:

Naming scheme: <catalogname>_cat.txt

Catalog contents:

• A commented header similar enough to SoFiA in that the data starts on line 18. (Need to work on making this more flexible!)
• The following column names: id, name, ra, dec, x, y, x_min, y_min, x_max, y_max, rms.
  • ra, dec are in decimal degrees (float)
  • x, y is the source center in pixels (float)
  • x(y)_min(max) are the min/max in pixels of the source (int), used to determine if a larger figure should be retrieved for an individ source.

Moment0 FITS file for each source with the following properties:

Naming scheme: <catalogname>_cubelets/<catalogname>_<id>_mom0.fits

FITS header contents (these may be non-standard for mom0 maps, but are required for estimating meaningful column density contours):

• SPECSYS or VELREF to refer to the spectral coord system of the original data
• CTYPE3 to determine the spectral units of the original data
  • If a cubelet is provided the coordinate system is determined from that so ctype3 isn't needed in a mom0 map. Alternatively, could determine this from the catalog column names (e.g the existence of 'freq', 'v_opt', 'v_rad', or 'v_app' to indicate the center of the galaxy.