Fig. 3From: Assessment of tomographic window and sampling rate effects on GNSS water vapor tomographyNumber of the voxels passed through by signal rays in each solution for each scheme in the eight selected days (pentagram, square, and circle denote the tomographic window of 30 min, 20 min and 10 min, respectively; red, green, blue, and blank represent the sampling rate of 30 s, 60 s, 150 s and 300 s, respectively)Back to article page