PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/31-12:42:50
G01     94.6           29.8                5.1 +/-    1.16       9.0 +/-    1.16  0.040 / 0.060
G07     121.2          46.4                5.8 +/-    0.92       7.7 +/-    0.92  0.040 / 0.040
G08     42.0           14.8                4.1 +/-    2.68      10.3 +/-    2.68  0.040 / 0.050
G11     74.5           42.5                4.5 +/-    0.77       6.3 +/-    0.77  0.040 / 0.050
G13     299.2          35.4                4.9 +/-    0.87       7.7 +/-    0.87  0.040 / 0.070
G17     210.9          44.6                6.1 +/-    0.65       8.3 +/-    0.65  0.040 / 0.060
G18     68.0           24.3                4.3 +/-    0.93       8.5 +/-    0.93  0.190 / 0.220
G19     211.5          24.0                5.7 +/-    2.11      11.3 +/-    2.11  0.100 / 0.210
G28     325.5          60.7                3.6 +/-    0.70       4.0 +/-    0.70  0.060 / 0.140
G30     85.1           78.7                5.4 +/-    0.66       5.5 +/-    0.66  0.080 / 0.120