Index: trunk/doc/modules/ModulesSDRS.tex
===================================================================
--- trunk/doc/modules/ModulesSDRS.tex	(revision 5378)
+++ trunk/doc/modules/ModulesSDRS.tex	(revision 5461)
@@ -1,3 +1,3 @@
-%%% $Id: ModulesSDRS.tex,v 1.65 2005-10-19 03:24:53 eugene Exp $
+%%% $Id: ModulesSDRS.tex,v 1.66 2005-11-03 01:25:16 price Exp $
 \documentclass[panstarrs,spec]{panstarrs}
 
@@ -877,7 +877,8 @@
 Overscan subtraction is controlled by the \code{overscan} boolean.  If
 it is \code{true}, then overscan subtraction is performed.  The
-prescan and/or overscan regions to be used are specified in
-\code{in->bias} (a linked list of subimages).  These shall be reduced
-to a single vector (in the dimension specified by \code{CELL.READDIR},
+prescan and/or overscan regions to be used are specified in by
+\code{CELL.BIASSEC} (accessed via the parent of the \code{pmReadout};
+a linked list of \code{psRegion}s).  These shall be reduced to a
+single vector (in the dimension specified by \code{CELL.READDIR},
 which is accessed via the parent of the \code{pmReadout}).
 
@@ -932,16 +933,18 @@
 then no fit shall be performed to the overscan.
 
-A bias frame shall be subtracted pixel-by-pixel from the input image
-if \code{bias} is non-NULL.  If \code{dark} is non-\code{NULL}, then
-the dark image, scaled by the ratio of dark times (from
+A \code{bias} frame shall be subtracted pixel-by-pixel from the input
+image if \code{bias} is non-NULL.  If \code{dark} is non-\code{NULL},
+then the dark image, scaled by the ratio of dark times (from
 \code{CELL.DARKTIME}) shall be subtracted pixel-by-pixel from the
-input image.  Note that the input image,
-\code{in}, and the \code{bias} and \code{dark} frames need not be the
-same size, but the function shall use the offsets in the image
-(\code{in->x0} and \code{in->y0}) to determine the appropriate offsets
-to obtain the correct pixel on the \code{bias}.  In the event that the
-\code{bias} image is too small (i.e., pixels on the input image refer
-to pixels outside the range of the \code{bias} image), the function
-shall generate an error.  Any pixels masked in the \code{bias} or
+input image.  The full-frame subtractions (both bias and dark) should
+only be performed on the image region specified by
+\code{CELL.TRIMSEC}.  Note that the input image, \code{in}, and the
+\code{bias} and \code{dark} frames need not be the same size, but the
+function shall use the offsets in the image (\code{in->x0} and
+\code{in->y0}) to determine the appropriate offsets to obtain the
+correct pixel on the \code{bias}.  In the event that the \code{bias}
+image is too small (i.e., pixels on the input image refer to pixels
+outside the range of the \code{bias} image), the function shall
+generate an error.  Any pixels masked in the \code{bias} or
 \code{dark} shall also be masked in the output.  The bias and dark
 images may be copied to the same type as the input image if required.