PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-19:42:50
G01     57.9           29.8               12.2 +/-    2.21      21.4 +/-    2.21  0.130 / 0.240
G07     143.3          20.7               12.3 +/-    2.68      26.7 +/-    2.68  0.160 / 0.240
G11     47.6           22.7               10.2 +/-    1.59      20.9 +/-    1.59  0.040 / 0.040
G13     260.1          34.4               16.1 +/-    1.14      25.8 +/-    1.14  0.040 / 0.040
G15     292.4          16.2               13.2 +/-    1.14      31.8 +/-    1.14  0.120 / 0.160
G17     260.9          75.0               14.6 +/-    0.49      15.0 +/-    0.49  0.070 / 0.160
G18     41.2           11.7               10.0 +/-    2.51      26.8 +/-    2.51  0.040 / 0.050
G19     234.8          51.0               14.3 +/-    1.70      17.8 +/-    1.70  0.040 / 0.050
G28     39.7           55.9               10.9 +/-    0.71      12.8 +/-    0.71  0.240 / 0.460
G30     145.0          49.4               13.8 +/-    0.55      17.6 +/-    0.55  0.180 / 0.400