PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-20:42:40
G01     39.7           14.0                9.1 +/-    1.52      23.3 +/-    1.52  0.100 / 0.150
G02     199.3          11.5               14.3 +/-   23.28      38.7 +/-   23.28  0.090 / 0.170
G06     173.3          43.5               15.7 +/-    1.02      21.7 +/-    1.02  0.140 / 0.460
G13     235.1          19.9               16.2 +/-    0.97      35.8 +/-    0.97  0.070 / 0.420
G15     268.6          11.1               12.1 +/-    3.30      32.9 +/-    3.30  0.080 / 0.210
G17     0.4            69.7               13.7 +/-    1.11      14.5 +/-    1.11  0.080 / 0.210
G19     283.8          69.2               13.1 +/-    0.66      13.9 +/-    0.66  0.050 / 0.080
G24     315.3          22.2                8.4 +/-    1.74      17.6 +/-    1.74  0.050 / 0.070
G28     76.1           45.1               13.0 +/-    0.63      17.4 +/-    0.63  0.270 / 0.420
G30     155.2          23.7               15.8 +/-    2.33      31.8 +/-    2.33  0.200 / 0.290