This attribute holds the ZoomMap scale factor, by which
coordinate values are multiplied (by the forward transformation)
or divided (by the inverse transformation). This factor is set
when a ZoomMap is created, but may later be modified. The
default value is unity.
Note that if a ZoomMap is inverted (e.g. by using astInvert),
then the reciprocal of this zoom factor will, in effect, be
used.
AST A Library for Handling World Coordinate Systems in Astronomy Starlink User Note 211 R.F. Warren-Smith & D.S. Berry 30th April 2003 E-mail:ussc@star.rl.ac.uk
Copyright (C) 2003 Central Laboratory of the Research Councils