PWV along the line of sight to a test target with coordinates RA = 0° and Dec = 0° observing from San Pedro Mártir between 727 hPa and 300 hPa every 10 min using GOES-16 imagery data of the Full Disk region from (a) 1−15 December 2019 and (b) 1−15 March 2020. Data are available only when the target was visible above an elevation angle of 30°. Note the difference in the limit of the vertical axes.