Cross-correlation of the Ba+ mask with the retrieved planetary spectra for the two observation nights of WASP-76b (top on 2018 September 3, and bottom on 2018 October 31). Left: cross-correlation functions of the averaged in-transit exposures on the planetary frame of reference. Center: Kp-plots. Map of the sum of all the individual exposures in the planet rest frame across different values in the Kp–planet velocity plane. The dashed green lines represent the expected position of the planetary signal on this map. Right: tomographic plots in the planetary rest frame. The white lines represent the transit contacts.