Out of transit spectra in the region of H α per night as calculated for the “Ingress” data (top) and “Egress” data (bottom). Nights are color coded as blue, orange, and green for night #1, #2 and #3 respectively. The vertical black dashed line corresponds to the laboratory wavelength of H α, with the red dashed line positioned at 6562.5Å, the position of the observed absorption feature. The black dashed horizontal line is the continuum level. Note the “Ingress” data for night #1 consists of 3 spectra, which decreases the observed S/N.