Each item in the list below will take you to a directory from where a comparison sequence may be downloaded. Each typically has magnitudes given in Johnson-Cousins B, V, and R filters and in the Sloan r' band, which is often denoted by SR. These are all in the format used by my APT2VSS script. Also in the directory is a "source-list" file which may be used directly by the APT photometry file. Consult software for more details.