Figaro tries to hold wavelength information in as general a way as possible. If a file called, say, `spect' contains a wavelength-calibrated spectrum, then there will be two data arrays in the structure held in the file. The main data array will be an array containing the actual spectrum, and the X-axis array will be an array of related size containing the wavelength information.
Each element of the X-axis array contains the wavelength value for the corresponding element of the spectrum-that is, for the centre of the corresponding data bin. For uncalibrated data, the X-axis array will usually not exist.
The `hdstrace' command may be used to examine elements of either the data or wavelength arrays, and the `ilist' command can be used to tabulate them.
FIGARO A general data reduction system