The images have been processed as described in Young at al. (1996), and are flat-fielded, sky-subtracted, continuum-subtracted (for the H&alpha), and flux-calibrated. In addition, bright stars have been removed from the R-band images, incompletely-subtracted stars have been removed from the H&alpha images, and cosmic rays have been removed from both types of images. In some cases the images have been cropped, generally to remove artifacts of one of the CCD cameras, or to exclude unusually bright foreground stars.

The fits files represent the flux-calibrated images, and the flux value at each pixel must be multiplied by 10^-18 to obtain the units of erg/cm^2/sec.

For specifics regarding the pixel size, calibration stars, and H&alpha filters used, see our paper "The Global Rate and Efficiency of Star Formation in Spiral Galaxies as a Function of Morphology and Environment," Young, J.S., Allen, L., Kenney, J. Lesser, A., and Rownd, B., Astron. J., 112, 1903-1927, (1996).