PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-20:27:50
G01     53.1           27.2                8.1 +/-    2.42      15.1 +/-    2.42  0.040 / 0.050
G06     179.8          19.0               12.8 +/-    0.96      28.9 +/-    0.96  0.040 / 0.040
G07     143.9          10.3               13.9 +/-    3.34      38.6 +/-    3.34  0.230 / 0.300
G11     45.2           17.7                9.1 +/-    1.77      21.3 +/-    1.77  0.300 / 0.360
G13     253.8          33.1               10.6 +/-    1.38      17.5 +/-    1.38  0.070 / 0.060
G15     286.6          16.4               10.4 +/-    1.90      25.1 +/-    1.90  0.050 / 0.050
G17     293.4          79.4               12.0 +/-    0.42      12.2 +/-    0.42  0.060 / 0.130
G19     240.0          57.0               11.8 +/-    2.71      13.8 +/-    2.71  0.060 / 0.140
G28     39.4           57.0               10.2 +/-    0.95      11.9 +/-    0.95  0.120 / 0.220
G30     147.3          43.6               13.5 +/-    1.11      18.6 +/-    1.11  0.100 / 0.220