Top: false-color JWST NIRCam image of the COLA1 field (C1F) coverage based on the F115W/F200W/F356W images. The vertical and horizontal axes represent the angular separation relative to COLA1, which is located in the center of the middle tile. Bottom: slice of the error cube of the C1F in the horizontal direction of the top panel. This illustrates how the field of view depends on wavelength, and that it is maximal around 3.8 μm, which is the undispersed wavelength of the NIRCam grism. We note that the [O III] doublet at the COLA1 redshift falls exactly at this wavelength. The units are relative to the minimum flux error across the field.