PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-12:58:10
G01     40.9           15.7                3.5 +/-    2.28       8.6 +/-    2.28  0.110 / 0.180
G06     175.9          39.0                6.1 +/-    1.11       9.0 +/-    1.11  0.110 / 0.190
G13     239.1          21.7                6.0 +/-    2.00      12.6 +/-    2.00  0.070 / 0.090
G15     271.5          12.2                7.9 +/-    1.70      21.0 +/-    1.70  0.090 / 0.110
G17     8.9            68.3                5.3 +/-    0.23       5.7 +/-    0.23  0.170 / 0.170
G19     284.5          70.9                6.3 +/-    0.45       6.6 +/-    0.45  0.190 / 0.150
G24     317.1          18.3                5.3 +/-    2.29      12.2 +/-    2.29  0.030 / 0.020
G28     73.1           46.1                5.3 +/-    1.28       7.1 +/-    1.28  0.030 / 0.020
G30     154.9          28.0                7.1 +/-    1.02      12.9 +/-    1.02  0.190 / 0.210