PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/27-17:57:40
G01     126.8          11.1               -0.5 +/-   39.44      -1.3 +/-   39.44  0.030 / 0.050
G07     67.5           66.0                9.4 +/-    0.61      10.2 +/-    0.61  0.030 / 0.050
G08     50.5           39.4                8.6 +/-    0.91      12.7 +/-    0.91  0.100 / 0.260
G09     179.0          37.9               12.4 +/-    1.08      18.8 +/-    1.08  0.100 / 0.260
G11     117.3          35.8               10.9 +/-    0.80      17.0 +/-    0.80  0.070 / 0.090
G13     320.9          12.1                6.8 +/-   17.14      18.1 +/-   17.14  0.070 / 0.100
G17     199.3          14.7               10.9 +/-    1.91      27.3 +/-    1.91  0.060 / 0.120
G18     102.0          16.4               10.1 +/-    0.74      24.3 +/-    0.74  0.080 / 0.140
G28     270.6          49.1               10.5 +/-    1.58      13.4 +/-    1.58  0.160 / 0.360
G30     334.9          61.9                9.4 +/-    0.71      10.5 +/-    0.71  0.150 / 0.300