PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/21-12:57:40
G01     72.7           33.1                3.7 +/-    1.02       6.1 +/-    1.02  0.030 / 0.020
G07     136.4          32.3                5.8 +/-    1.17       9.7 +/-    1.17  0.020 / 0.020
G11     54.0           30.7                4.7 +/-    1.59       8.0 +/-    1.59  0.040 / 0.080
G13     276.1          37.9                5.3 +/-    1.96       8.0 +/-    1.96  0.050 / 0.090
G15     307.1          12.9                2.1 +/-    1.67       5.4 +/-    1.67  0.050 / 0.120
G17     231.0          69.4                6.3 +/-    0.40       6.7 +/-    0.40  0.060 / 0.110
G18     49.8           18.5                4.7 +/-    2.82      10.7 +/-    2.82  0.070 / 0.070
G19     222.8          36.8                6.1 +/-    1.57       9.3 +/-    1.57  0.050 / 0.080
G28     16.2           59.7                5.5 +/-    0.79       6.2 +/-    0.79  0.180 / 0.170
G30     133.6          65.3                6.5 +/-    0.35       7.0 +/-    0.35  0.100 / 0.250