# This is a cubic distortion for the WF4
# taken from the WFPC2 Instrument Handbook
cubic 
772.904 1.37619e-2 2.18899 1.33326e-6 -4.00828e-6
-5.71282e-7 -2.00520e-9 -7.86673e-8 -3.37491e-9 -7.81490e-8
 
-774.638 -2.18688 1.29831e-2 1.30814e-6 2.01760e-6
-8.47656e-7 7.70408e-8 -1.68514e-9 7.75257e-8 -3.69210e-10