Validation of our astrometric alignment. The left panel shows the astrometric difference between our detection image and Gaia DR3 (Gaia Collaboration et al. 2018), while the right panels shows the astrometric difference between the detection image (stack of all long-wavelength (LW) NIRCam images) and the F115W image, which is used as a representative example to show the relative astrometric accuracy among the different NIRCam bands. Sources from both PRIMER-COSMOS and PRIMER-UDS are included in this figure. Outliers in the right panel include galaxies with different morphologies in different bands.