The ASTRO catalog format is one of the two following ones:
A comma separated value file, including the frequency in MHz, the
species name, and the transition name, e.g.:
150E3; MOLE; TRANSITION;
A list-directed file, with the same information, e.g.:
150E3 'MOLE' 'TRANSITION'
Lines beginning with an exclamation mark are considered as comments.
The first line **MUST** be a comment line.
A default catalog (with no implied warranty) is given in gag_data:mole-
cules.dat.