You can change what the
display system shows you and how it displays it by editing the
disp.dat file, either directly or by using the
The default displays should be fine for most people. These are
described here. The main reason why you'd want to change anything from
the defaults at the moment is that when plotting a spectrum, the display
system will autoscale, which you don't want to do if there's a large spike
or other anomoly in the data. See "Changing the plotting scales" below for
Generally, two windows are used to show you data as soon as possible
after it comes off the array; one GAIA window, which shows you
an image containg the data, and a KAPPA view window which shows
histograms, extracted spectra and the like.
A similar two windows are used to show you more reduced data to
display intermediate results and show you how well you're accumulating
your signal to noise ratio etc. A GAIA window shows you the
current group file image - ie the sky subtracted frame, or the
difference of the main beam and offset pairs aquired so far. A
KAPPA window is then used to show you the divided by standard
and flux calibrated spectra.
Changing the plotting scales
The pipeline display system is controlled by a text file called
disp.dat, which resides in your $ORAC_DATA_OUT directory.
You can edit this file manually with your favourite text editor, or you can
use the oracdisp utility.
The disp.dat file contains one line for each type of data that is to be
displayed, specifying the file type that this refers to, the plotting tool to
use and various parameters of the plot - ie axis scales, autoscaling etc.
One important thing to remember is that the display system allways works in
array co-ordinates, ie. x is wavelength, y is along
the slit, and z is the data value.
To turn off autoscaling of your spectral plots:
The new settings will take effect next time a spectrum of that type is
displayed, which if you're still oberving the same group will be when the next
pair of observations is complete.
- Go either to the xterm where you launched oracdr from, or get a new
xterm and run oracdr_cgs4 in it.
- run oracdisp
- Select the line for the type of plot you wish to change. This will
probably be DBS for the divided by standard spectra, or FC
for the flux calibrated spectra. Double-Click on the appropriate line in the
lower pane of the oracdisp window. You may have to scroll down using the
scrollbar to find the line you want.
- In the upper portion of the oracdisp window, find the Z: line
and click the button next to "Set" to go from autoscale to
set mode, and change the zmin and zmax values to
the axes range you would like displayed.
- Click the "Modify" button at the bottom of the top pane of the oracdisp
- Click the "Configure" button at the bottom of the oracdisp window.