Data Analysis Library The WFPC2 Data Analysis Library is designed to provide easy reference to a wide variety of WFPC2 related information. Photometry WFPC2 Photometry & SYNPHOT Resources. SYNPHOT WFPC2 Photometry & SYNPHOT Resources. PSFs Resources for PSF subtraction, etc. CTE Documentation regarding the Charge Transfer Effeciency of WFPC2. Drizzle This page contains links to Dither/Drizzle documentation and software. Visiting STScI Instructions for WFPC2 Observers planning on visiting STScI to reduce and analyse data.