Table 2 : HRC RAMP+RAS/Cal Field Points

Table 3 : WFC RAMP+RAS/Cal Field Points

Note :

1. The focus sweep at each field point is executed by the SMS listed in the last column. The WFC field points are read out as 400x400 subarrays with the appropriate amplifier while the entire HRC frames are read out with amp B.
2. (X,Y) : Nominal location of the PSFs on the the full-field WFC and HRC frames. +X is measured along the amps A-B axis and +Y along the amps A-C axis. The positions include the physical overscans in X (24 pixels for WFC and 19 pixels for HRC). For the WFC, the two chips are butted together and the virtual overscans are eliminated while in the HRC amp-B read-out, the virtual overscan is at the top of the image. See Figs 3 and 4.
   
3. (x,y)  : Nominal location of the PSFs on the 400x400 WFC subarrays with respect to the amp A corner. There are no overscan regions.
   
4. x_corner, y_corner : Coordinates of the corner of the 400x400 subarray. The +x axis is defined along the A-C axis and +y along the A-B axis.