SYSTEM: V2.9
NUMBER: 145 MODULE: apextract SYSTEM: V2.9 DATE: Wed Mar 27 16:57:13 MST 1991 FROM: valdes BUG: For some default background functions and sample regions a singular solution error can occur. This is caused by defining the function range to be the entire image dimension while the sample region is only a small part of this range. It probably also depends on the function type and order and the degree of curvature in the fitted data. When apertures are read from the database or reset by the 'b' mode in APEDIT the fitting limits are set to the limits of the sample region. STATUS: The singular solution message should be harmless. Reading apertures from a database does not have this problem. Entering the 'b' mode in APEDIT (where the message might be seen) and exiting will fix the fitting function properly. Of course if background subtraction is not required this problem does not arise. The problem has been fixed for V2.10.