References for data used in current DOLPHOT module

- Zero Points: calculated using the jwst_1126.pmap, delivered Sep. 14, 2023, obtained at 10/11/23 from https://jwst-docs.stsci.edu/jwst-near-infrared-camera/nircam-performance/nircam-absolute-flux-calibration-and-zeropoints.  Note that the Vega-Sirius calibration is used by default; the Vega-only calibration can be applied by copying nircam/filters_vega.dat to nircam/filters.dat.  (If doing so, it is best to save a copy of the original nircam/filters.dat to a different filename so that it can be used.)
- PSFs: Generated using WebbPSF version 1.2.1 using distorted PSF models.  Key inputs for these PSFs were time-dependent OPD maps from 7/24/2022, 5x oversampling, and an input spectrum of a G5V model from the Phoenix stellar library. Input spectrum is sampled over 21 points for broadband filters, 9 points for medium band and 5 points for narrow band filters.
- Encircled Energy: Calculated from the PSFs
- Distortions: Stage 2 files contain distortion data, but UseWCS=2 is required to make use of this
- Pixel Area: N/A - Stage 2 FITS files contain PAM data
- Gain, readout noise: downloaded 10/11/22 from https://jwst-docs.stsci.edu/jwst-near-infrared-camera/nircam-instrumentation/nircam-detector-overview/nircam-detector-performance.  Note that readout noise values are divided internally by sqrt(2) as the CDS read noise values are based on two images.
- Data quality: downloaded 10/11/22 from https://jwst-pipeline.readthedocs.io/en/latest/jwst/references_general/references_general.html
