Comparison of photometry in the r, i, J and 4.5 μm bands in ELAIS-N1. The colour-map shows the median magnitude difference computed over cells of 0.06 deg² between our χ² and publicly available catalogues from SDSS DR12, DXS DR10 and the SWIRE survey for the r, J and 4.5 μm bands, respectively. For the i-band, we compare the photometry between PS1 and HSC within our χ² catalogue. We use aperture corrected magnitudes based on the 3 arcsec aperture for optical-NIR bands and 4 arcsec for the 4.5 μm band. There is excellent agreement between our χ² and publicly released catalogues, with differences in optical bands likely driven by zero-point calibration of individual PS1 chips.