created from $\gtrsim 20$ zero second exposures by discarding the highest and lowest value at each pixel and taking the median. Master sky and dome flats were similarly constructed after normalizing the counts in the individual images. Those calibration files were then used to bias-subtract, flat-field, and illumination-correct the raw data frames. Dark current was measured to be an insignificant $\sim 1$ e$^{-}$ per pixel per hour and was not corrected for.

Misalignment between the trace of the light in the dispersion direction and the orientation of the CCD detector was rectified via the mean trace of the standard stars for each night, providing alignment to within a pixel across the detector. A two-dimensional sky subtraction was performed using individually selected sky apertures, followed by a wavelength calibration applied from the HeArNe comparison lamps taken at the same telescope pointing. Airmass dependent atmospheric extinction and reddening were corrected for using the standard Kitt Peak extinction curve [@crawford70].

For each galaxy, the multiple sub-exposures were combined, eliminating cosmic rays in the process. The resulting images were then flux-calibrated using the sensitivity curve derived from the standard star observations taken throughout a given night. Finally, the trace fit to the strongest continuum 