PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-17:43:10
G02     207.4          42.9               11.8 +/-    0.94      16.4 +/-    0.94  0.040 / 0.060
G06     122.9          77.9                9.0 +/-    0.55       9.2 +/-    0.55  0.040 / 0.060
G12     313.6          26.2                7.7 +/-    1.47      14.6 +/-    1.47  0.100 / 0.150
G17     44.8           42.2                7.8 +/-    1.71      10.9 +/-    1.71  0.070 / 0.120
G19     13.6           61.0                8.7 +/-    0.77       9.8 +/-    0.77  0.030 / 0.020
G24     284.6          42.3                9.4 +/-    1.48      13.2 +/-    1.48  0.020 / 0.020
G28     111.2          24.7                9.0 +/-    1.47      17.8 +/-    1.47  0.050 / 0.040