PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/21-11:12:50
G01     60.9           30.9                4.9 +/-    1.10       8.4 +/-    1.10  0.040 / 0.040
G07     141.8          22.3                4.6 +/-    0.94       9.6 +/-    0.94  0.040 / 0.040
G11     48.0           23.3                2.5 +/-    0.85       5.0 +/-    0.85  0.050 / 0.120
G13     263.0          35.7                7.5 +/-    0.96      11.7 +/-    0.96  0.050 / 0.130
G15     299.3          14.2                1.2 +/-    1.01       3.0 +/-    1.01  0.050 / 0.100
G17     260.4          77.5                7.5 +/-    1.10       7.6 +/-    1.10  0.050 / 0.100
G18     41.9           12.3                1.7 +/-    1.28       4.5 +/-    1.28  0.080 / 0.120
G19     230.9          45.3                8.5 +/-    1.44      11.4 +/-    1.44  0.070 / 0.130
G28     32.9           57.4                5.1 +/-    0.40       5.9 +/-    0.40  0.090 / 0.210
G30     143.6          54.8                7.0 +/-    1.34       8.3 +/-    1.34  0.140 / 0.250