PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-21:43:10
G01     55.0           28.4               10.9 +/-    0.85      19.7 +/-    0.85  0.080 / 0.330
G07     144.5          18.0               15.7 +/-    1.37      36.3 +/-    1.37  0.100 / 0.310
G11     46.8           20.9                9.6 +/-    0.92      20.6 +/-    0.92  0.070 / 0.100
G13     256.9          33.1               16.2 +/-    1.64      26.6 +/-    1.64  0.060 / 0.080
G15     289.0          16.3               12.0 +/-    1.51      28.9 +/-    1.51  0.080 / 0.300
G17     268.1          75.2               16.7 +/-    0.43      17.2 +/-    0.43  0.070 / 0.290
G19     238.5          54.3               16.7 +/-    1.37      20.1 +/-    1.37  0.070 / 0.220
G28     44.6           54.8               13.2 +/-    1.02      15.7 +/-    1.02  0.080 / 0.280
G30     146.5          45.4               15.2 +/-    0.77      20.4 +/-    0.77  0.040 / 0.060