Formats for IMWCS Match Files

As of version 2.8.7, 10 January 2001, imwcs can use a file of x,y,RA,Dec matches to initialize the WCS fit. If no other catalog is given, the program stops after fitting a WCS to these stars, writing it to the image header, if requested with the -w option. If another catalog is given, imwcs proceeds, as shown in this example. For now, only simple ASCII files are supported. Lines beginning with a # are skipped by imwcs. Only the first four elements of each line are read; x and y may preceed or follow right ascension and declination, though if RA and Dec are first they must be in the colon-separated format. Tabs or spaces may separate the columns. The following files are all legal: