PLOT N1 N2 [W0] [ECORR] [APERTURE] -- Plots spectra
Parameters:
N1 -- Slot number of first spectrum to plot.
N2 -- Slot number of last spectrum to plot.
W0 -- Central wavelength for velocity plots (Angstroms)
ECORR -- Yes if you want a correction to be applied for extinction
in response or efficiency plots. Without this correction
the response and efficiency are given as observed and so
will get worse with airmass. With the correction, the program
uses the airmass, grey and rayleigh coefficients from the
header to correct to zero airmass. All being well with the
flux calibration, the result should be constant from star
to star. If the airmass is not found it will be taken to
be 0, if grey and rayleigh are not found (real items)
they will be taken to be 0 and 1.
APERTURE-- Aperture of telescope for efficiency plots. In metres.
Routine normally picks plot ranges automatically unless you allow
it to prompt you for parameters in which case it also allows you
to change ranges. If you want to hold ranges fixed, use command
'XYR' to fix them (X or Y or both). If you want to add to a plot,
use the command 'FLAGS' to set CLOSE to false. Plot will then not
be closed and then reopened as usual. To alter characteristics of
the plot such as the axis colours, etc, try the command POPT.
Use AXES to change the default axes.
Selection criteria apply to the spectra plotted.
This command belongs to the classes: display .