AXES Xaxis Yaxis -- Sets axes for spectrum plots.
Parameters:
XAXIS -- Xaxis type. Choices are:
pixels -- pixel scale (always possible)
angstroms -- angstrom wavelength scale (needs wavelength cal)
microns -- micron wavelength scale (needs wavelength cal)
nannometres -- nannometre wavelength scale (needs wavelength cal)
km/s -- Velocity scale in km/s. Will be prompted for a
central wavelength when plotting. Needs
wavelength cal
YAXIS -- Yaxis type. Choices are:
counts -- raw counts
millijanskys -- flux density in millijanskys
1 mJy = 10**-26 W/m**2/Hz = 10**-26 ergs/s/cm**2/Hz
1 mJy = 16.4 on AB mag scale of Oke, roughly
matches V mag.
flambda -- flux in ergs/s/cm**2/A
AB -- AB mags = 16.4 - 2.5 LOG10(f/1mJy)
response -- Measures reponse of detector etc as AB mag needed
to get 1 count/sec/A. Plot allows you to correct
this to zero airmass if need be.
efficiency -- linearised version of rsponse which allows you
to include telescope aperture to get fraction of
photons detected. Again can be corrected for
extinction.
This command belongs to the class: display