PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-13:58:10
G01     107.7          25.2                7.4 +/-    0.65      14.3 +/-    0.65  0.030 / 0.030
G07     105.9          58.8                8.1 +/-    0.45       9.3 +/-    0.45  0.030 / 0.030
G08     41.9           20.2                5.5 +/-    0.61      12.0 +/-    0.61  0.040 / 0.100
G09     173.9          12.8                6.8 +/-    1.59      17.8 +/-    1.59  0.040 / 0.070
G11     89.0           42.6                8.2 +/-    0.32      11.4 +/-    0.32  0.070 / 0.130
G13     310.0          28.4                6.4 +/-    2.67      11.6 +/-    2.67  0.080 / 0.130
G17     205.5          37.3                8.6 +/-    1.20      13.1 +/-    1.20  0.030 / 0.050
G18     80.7           24.1                6.6 +/-    0.61      13.2 +/-    0.61  0.050 / 0.060
G28     316.3          60.8                6.7 +/-    0.76       7.5 +/-    0.76  0.030 / 0.040
G30     16.2           77.5                6.9 +/-    0.83       7.0 +/-    0.83  0.030 / 0.040