PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-14:42:40
G01     85.0           32.7                7.6 +/-    1.06      12.5 +/-    1.06  0.030 / 0.030
G07     129.3          41.7                8.0 +/-    1.29      11.3 +/-    1.29  0.030 / 0.040
G11     63.3           37.4                6.4 +/-    0.47       9.7 +/-    0.47  0.070 / 0.100
G13     289.2          37.2                7.9 +/-    0.86      12.1 +/-    0.86  0.070 / 0.110
G17     218.0          58.0                9.4 +/-    0.45      10.8 +/-    0.45  0.060 / 0.120
G18     59.2           22.7                6.2 +/-    0.93      12.8 +/-    0.93  0.060 / 0.110
G19     216.9          28.2                8.9 +/-    2.82      16.2 +/-    2.82  0.050 / 0.060
G28     357.4          61.4                7.4 +/-    1.14       8.3 +/-    1.14  0.050 / 0.060
G30     115.7          73.7                8.1 +/-    0.59       8.4 +/-    0.59  0.040 / 0.060