PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/25-22:28:00
G01     39.2           13.1                9.7 +/-    0.86      25.4 +/-    0.86  0.100 / 0.410
G02     199.1          13.2               23.1 +/-    2.53      60.1 +/-    2.53  0.060 / 0.400
G06     173.5          44.4               18.6 +/-    0.67      25.3 +/-    0.67  0.070 / 0.130
G13     234.3          19.0               17.4 +/-    2.90      39.3 +/-    2.90  0.090 / 0.160
G15     267.0          10.7               13.4 +/-    2.04      36.9 +/-    2.04  0.040 / 0.080
G17     359.4          69.6               13.8 +/-    0.69      14.7 +/-    0.69  0.040 / 0.080
G19     289.2          70.1               13.5 +/-    0.79      14.2 +/-    0.79  0.080 / 0.180
G24     314.9          22.8                8.2 +/-    1.19      16.9 +/-    1.19  0.110 / 0.190
G28     77.7           44.3               13.1 +/-    0.84      17.9 +/-    0.84  0.090 / 0.390
G30     155.2          21.8               17.4 +/-    2.39      36.6 +/-    2.39  0.090 / 0.360