Steps of host-galaxy template subtraction. Top left: Optical-band science image created from stacking multiple images and zoomed in on the location of SN 2016adj. North is up and east is to the left. Top right: Residual obtained after subtraction of a modeled PSF from the PSF of the bright foreground star located in close proximity to SN 2016adj. Bottom right: Mask applied to the residual of the bright star. Bottom left: Region surrounding SN 2016adj copied into the initial science image after performing host-galaxy template subtraction of the masked science image.