Contrast of the raw CCF, extracted by fitting a Gaussian profile. Each night is color-coded (blue, orange, and green for first, second and third night, respectively). The first few in-transit exposures of the first night are clearly deviating from the trend. The red, yellow and green regions correspond to out-of-transit, partial-transit and full-transit times, with the transit contact points plotted as gray (T₁,T₄) or black (T₂, T₃) dotted lines.