PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-22:57:40
G02     199.5          19.2               16.9 +/-    1.43      38.0 +/-    1.43  0.100 / 0.350
G06     171.7          51.1               13.8 +/-    0.90      17.2 +/-    0.90  0.090 / 0.270
G13     229.6          14.9               14.2 +/-    2.03      35.3 +/-    2.03  0.050 / 0.080
G17     10.3           65.2                9.4 +/-    1.18      10.3 +/-    1.18  0.040 / 0.080
G19     310.4          71.1                9.4 +/-    1.09       9.8 +/-    1.09  0.100 / 0.180
G24     311.8          27.5                9.1 +/-    2.19      16.8 +/-    2.19  0.130 / 0.180
G28     85.2           41.0               10.8 +/-    0.72      15.5 +/-    0.72  0.040 / 0.050
G30     156.3          15.8               16.3 +/-    1.78      39.8 +/-    1.78  0.060 / 0.050