Water contribution functions for each of our seven observations, calculated with the best fit 3D water abundance field in the beacon from Step 3 (see Section 4.3). Dashed black lines refer to a line of sight at the planet disc centre. Dashed-dotted blue lines and dotted green lines correspond to a line of sight at, respectively, the western and eastern equatorial limbs. The solid red lines depict a line of sight at the beacon centre.