PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-21:27:50
G01     49.9           25.4               11.2 +/-    1.35      21.6 +/-    1.35  0.080 / 0.340
G06     177.4          25.7               16.9 +/-    2.40      32.6 +/-    2.40  0.090 / 0.330
G07     146.5          12.7               16.4 +/-    3.14      43.1 +/-    3.14  0.060 / 0.130
G11     45.0           16.1                8.8 +/-    2.37      21.3 +/-    2.37  0.060 / 0.110
G13     250.6          30.2               15.1 +/-    1.06      26.3 +/-    1.06  0.080 / 0.290
G15     283.6          15.7               12.7 +/-    1.88      31.1 +/-    1.88  0.060 / 0.340
G17     295.3          77.2               13.0 +/-    0.60      13.3 +/-    0.60  0.040 / 0.060
G19     246.6          59.0               15.2 +/-    0.70      17.4 +/-    0.70  0.040 / 0.060
G28     53.3           52.6               10.8 +/-    0.68      13.2 +/-    0.68  0.110 / 0.460
G30     149.5          39.8               14.5 +/-    1.03      21.2 +/-    1.03  0.120 / 0.540