PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-04:58:00
G01     96.1           30.2                6.2 +/-    0.59      10.8 +/-    0.59  0.040 / 0.050
G07     120.4          49.5                7.0 +/-    0.64       8.9 +/-    0.64  0.040 / 0.030
G08     42.0           11.7                3.0 +/-    2.28       8.0 +/-    2.28  0.030 / 0.040
G11     76.0           41.4                3.7 +/-    1.29       5.3 +/-    1.29  0.040 / 0.040
G13     301.3          33.1                1.7 +/-    1.50       2.8 +/-    1.50  0.150 / 0.200
G17     211.0          49.2                6.8 +/-    0.60       8.6 +/-    0.60  0.250 / 0.220
G19     212.3          23.4                5.7 +/-    2.18      11.6 +/-    2.18  0.060 / 0.080
G28     340.4          61.9                3.3 +/-    0.72       3.7 +/-    0.72  0.050 / 0.100
G30     87.5           77.3                5.5 +/-    0.43       5.7 +/-    0.43  0.050 / 0.130