PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/29-10:42:40
G07     355.6          64.5                4.8 +/-    0.56       5.3 +/-    0.56  0.120 / 0.160
G08     88.5           53.9                6.3 +/-    1.42       7.6 +/-    1.42  0.070 / 0.130
G09     183.9          64.5                6.3 +/-    0.52       7.0 +/-    0.52  0.030 / 0.040
G11     139.9          19.9                4.9 +/-    1.91      10.9 +/-    1.91  0.030 / 0.040
G23     156.7          28.6                5.6 +/-    1.30      10.0 +/-    1.30  0.090 / 0.120
G27     48.0           26.8                3.1 +/-    1.57       5.9 +/-    1.57  0.070 / 0.150
G28     242.5          30.7                5.9 +/-    1.73      10.2 +/-    1.73  0.030 / 0.030
G30     309.7          42.1                4.5 +/-    1.12       6.3 +/-    1.12  0.030 / 0.030