PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-15:12:40
G01     42.0           17.2                9.1 +/-    1.66      21.4 +/-    1.66  0.080 / 0.180
G06     175.4          37.4               14.6 +/-    1.66      22.2 +/-    1.66  0.090 / 0.220
G13     241.1          23.2               10.7 +/-    2.28      21.8 +/-    2.28  0.070 / 0.090
G15     274.8          12.8                7.2 +/-    0.91      18.8 +/-    0.91  0.070 / 0.080
G17     5.4            70.0               10.4 +/-    0.43      11.0 +/-    0.43  0.030 / 0.020
G19     277.6          70.1               10.5 +/-    0.60      11.1 +/-    0.60  0.030 / 0.020
G28     70.0           47.4               10.3 +/-    0.87      13.4 +/-    0.87  0.190 / 0.290
G30     154.4          31.0               11.6 +/-    1.92      19.9 +/-    1.92  0.120 / 0.280