PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/20-12:57:40
G01     75.0           33.2                3.0 +/-    0.85       5.0 +/-    0.85  0.030 / 0.020
G07     135.2          34.1                5.9 +/-    0.56       9.6 +/-    0.56  0.030 / 0.020
G11     55.4           32.0                3.5 +/-    1.53       5.9 +/-    1.53  0.040 / 0.080
G13     278.6          38.0                3.6 +/-    2.85       5.4 +/-    2.85  0.050 / 0.090
G15     308.7          12.4                2.6 +/-    2.14       6.8 +/-    2.14  0.050 / 0.060
G17     227.8          67.6                4.5 +/-    0.98       4.9 +/-    0.98  0.050 / 0.060
G18     51.4           19.4                3.5 +/-    3.81       7.9 +/-    3.81  0.060 / 0.100
G19     221.5          35.1                5.3 +/-    2.40       8.4 +/-    2.40  0.070 / 0.070
G28     12.7           60.1                4.7 +/-    1.49       5.3 +/-    1.49  0.080 / 0.210
G30     131.1          67.1                5.6 +/-    0.36       6.0 +/-    0.36  0.160 / 0.190