Continuum-subtracted VGPS spectra (black line) towards sources from the CORNISH UCHII region sample were used to solve their KDA. The red dashed line indicates the tangent point velocity. The blue spectrum shows the measured CO spectrum, with its corresponding y-axis also in blue. The green dot-dashed line represents the CO source velocity, with the region marked in grey on each side showing the expected uncertainty of ±10 km s⁻¹ due to streaming motions. The H I  spectrum of G024.4721+00.4877 is practically identical to G024.4698+00.4954 (top row, left) and therefore was omitted.