The complete figure set (26 images) is available in the online journal.

Principal components of the relative pixel fluxes (RPFs) for the first visit of GJ 357 b for NRS1 (left panel) and NRS2 (right panel). Left column of each panel: map of correlation coefficients between individual pixel fluxes and each principal component in the detector plane. Lighter colors indicate pixels that have a high positive correlation with the principal component, and dark colored pixels have a large negative correlation. Center column of each panel: principal components of the RPFs. Right column of each panel: power spectral density (PSD) of the principal component. The full figure set (26 images) is available.