==========================================================================

The shifts introduced by the filters, expressed relative to the F606
positions, were found (by Mark Dickinson using geomap) to be as follows:

Chip         F300W	    F450W          F814W

pc1       +0.83 -0.45	 +0.69 +0.02    -0.35  -0.41
wf2       -0.45 -0.83	 +0.02 -0.69    -0.41  +0.35
wf3       -0.83 +0.45	 -0.69 -0.02    +0.35  +0.41
wf4       +0.45 +0.83	 -0.02 +0.69    +0.41  -0.35

These are in the pixels of the specified chip and are in the sense that
they should be applied on that chip to bring that chip into registration
with the same chip using the f606w filter.