Examples of the output of the cosmic ray and hot pixel rejection algorithm. The original unmasked 2D spectra are shown in the left, and the masked spectra are shown on the right with masked regions displayed in pink. Top: excerpt from the brightest z ∼ 4 quiescent galaxy; bottom: excerpt from a z ∼ 2 filler SFG, which has an emission line at λ = 2.098 μm. Both spectra are taken from the same K-band exposure in the COSMOS mask, with excellent seeing (0.42 ′′).
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