Stacked SEDs (blue) with posterior median SED models (yellow). Left: stacked likely z = 6.6 LAE candidates in the NB921 catalogue, consisting of the non-matched sample and probable LAEs in the matched sample. Right: stacked likely contaminants in the NB921 matched optical sample, fitted with fixed z = 1.47. The stack of likely contaminants shows brighter NIR and mid-IR fluxes, highlighting the importance of using NIR data in LAE selection.