PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-18:12:50
G01     107.6          25.4               11.5 +/-    1.11      22.2 +/-    1.11  0.240 / 0.170
G07     105.9          59.0               11.7 +/-    1.16      13.4 +/-    1.16  0.180 / 0.150
G08     42.3           22.7                7.2 +/-    1.77      14.9 +/-    1.77  0.030 / 0.020
G09     175.0          14.1               12.2 +/-    1.55      30.9 +/-    1.55  0.030 / 0.030
G11     90.7           43.0               13.1 +/-    0.67      18.2 +/-    0.67  0.080 / 0.140
G13     310.1          28.2               10.3 +/-    1.24      18.7 +/-    1.24  0.080 / 0.130
G17     206.5          34.5               13.8 +/-    0.88      22.1 +/-    0.88  0.030 / 0.040
G18     81.2           24.3               12.0 +/-    1.47      23.9 +/-    1.47  0.030 / 0.040
G28     317.4          60.9                9.1 +/-    0.69      10.2 +/-    0.69  0.040 / 0.050
G30     25.4           78.0               11.1 +/-    0.87      11.4 +/-    0.87  0.040 / 0.050