Examples of negative training samples categorized by their TRACTOR morphological model type. From left to right, the columns display representative examples of point sources (PSF), de Vaucouleurs (DEV) profiles, exponential (EXP) profiles, round exponential (REX) profiles, and Sérsic (SER) profiles. The parent image sizes are 512 × 512 pixels. The green dashed boxes indicate representative 256 × 256 pixel crops generated via random spatial jittering.