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The ASTRO catalog format is one of the two following ones:
A comma separated value file, including the frequency, 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 (or just start by a ;) That line may specify the unit of Frequencies in the catalog (Hz, kHz, MHz, GHz). If no recognized unit is found in this line, frequencies are assumed to be in MHz.
A default catalog (with no implied warranty) is given in gag_data:molecules.dat.