Next: Parameters Up: XRTSUB Prev: Variance
Warning
XRTSUB assumes that neither the source box nor the background box
overlap any of the struts or the central circle. If this isn't true,
e.g. if your background file is a spectrum which has been taken in
an annulus around the whole image at a large radius, then the program
will overestimate the area of the background box. This problem may
be alleviated by using a spectral image as the background file (see
the advice section on extended objects).
Next: Parameters Up: XRTSUB Prev: Variance