PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-13:28:00
G01     87.5           32.1                5.8 +/-    1.01       9.8 +/-    1.01  0.020 / 0.020
G07     127.5          40.8                7.5 +/-    0.84      10.8 +/-    0.84  0.030 / 0.020
G11     64.9           36.5                7.0 +/-    1.57      10.8 +/-    1.57  0.040 / 0.050
G13     294.4          35.3                9.1 +/-    3.76      14.3 +/-    3.76  0.060 / 0.050
G17     215.8          58.3                7.7 +/-    0.90       8.9 +/-    0.90  0.090 / 0.080
G19     215.4          30.8                7.2 +/-    1.56      12.5 +/-    1.56  0.090 / 0.090
G28     353.6          61.4                6.4 +/-    0.70       7.2 +/-    0.70  0.040 / 0.050
G30     105.2          76.4                7.3 +/-    0.64       7.4 +/-    0.64  0.050 / 0.050