PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-14:27:30
G01     93.3           31.0               -0.7 +/-    9.38      -1.1 +/-    9.38  0.020 / 0.020
G07     123.0          47.9               -3.6 +/-    9.69      -4.6 +/-    9.69  0.020 / 0.020
G11     71.1           40.4               -2.6 +/-    9.07      -3.8 +/-    9.07  0.040 / 0.040
G13     297.4          35.3               -1.9 +/-    8.56      -2.9 +/-    8.56  0.040 / 0.040
G17     212.5          51.0               -2.1 +/-    9.84      -2.6 +/-    9.84  0.090 / 0.120
G18     66.2           24.2                0.4 +/-    9.55       0.7 +/-    9.55  0.100 / 0.140
G19     213.7          21.9                2.1 +/-    9.35       4.4 +/-    9.35  0.100 / 0.100
G28     343.5          61.9                5.6 +/-    1.22       6.3 +/-    1.22  0.080 / 0.090
G30     90.5           78.6               -6.3 +/-    9.06      -6.4 +/-    9.06  0.070 / 0.130