CCFs for ¹³CO and ${\mathrm{H}}_2^{18}\mathrm{O}$. The CCFs were calculated for each order–detector pair and summed over all orders and detectors, after which they were converted to S/N by dividing by the standard deviation of the CCFs away from the peak, excluding the values within −100 < v_rad < 100 km s⁻¹. The different colours represent the different targets, J0835, J0501, and J0500. The S/Ns of the peaks of the CCFs for each individual species are shown in the upper-right corner.