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Method
WELLARD (now XRTARD) lets the user specify a region on an image by selecting a shape
from a menu and setting its extent using the cursor. A textfile
containing the shapes selected is produced. You may select as many shapes
as you like, however, you should heed the WARNING item.
The initial menu displayed by WELLARD (now XRTARD), contains the simple shapes, box,
circle and annulus, a QUIT button (which means exit and save the ARD file),
and an XRT button.
The XRT button produces a further menu with buttons
to write the PSPC rib structure into the file or include sources
found by PSS. The latter calculates the radius of a circle at the
off-axis angle of the source which will include 95% of the source
counts (at an energy of 0.2 keV), this uses the PSF determination
calculated by I.Georgantopolous. A circle of this radius is then written
into the ARD file.
Next: WARNING Up: WELLARD XRTARD Prev: WELLARD XRTARD