PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/23-04:27:50
G10     250.2          26.2                8.7 +/-    1.45      16.5 +/-    1.45  0.030 / 0.040
G13     54.1           30.3                5.8 +/-    1.91      10.1 +/-    1.91  0.040 / 0.040
G15     87.5           57.6                7.4 +/-    1.09       8.6 +/-    1.09  0.100 / 0.150
G20     289.8          65.3                6.4 +/-    0.48       7.0 +/-    0.48  0.050 / 0.130
G21     332.5          59.6                5.5 +/-    0.77       6.3 +/-    0.77  0.030 / 0.040
G26     266.8          15.8                9.2 +/-    1.53      22.4 +/-    1.53  0.040 / 0.040
G29     165.1          51.1                7.8 +/-    0.53       9.7 +/-    0.53  0.050 / 0.030