PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/22-11:42:40
G02     48.3           41.8                2.6 +/-    1.27       3.7 +/-    1.27  0.030 / 0.020
G05     96.9           69.5                4.1 +/-    0.51       4.4 +/-    0.51  0.030 / 0.030
G12     190.9          51.2                4.4 +/-    0.47       5.5 +/-    0.47  0.050 / 0.070
G20     202.9          40.0                3.9 +/-    1.12       5.7 +/-    1.12  0.050 / 0.070
G21     260.5          11.8                0.2 +/-    9.93       0.5 +/-    9.93  0.040 / 0.040
G25     266.5          58.4                4.0 +/-    1.40       4.6 +/-    1.40  0.040 / 0.040
G29     320.4          43.9                1.8 +/-    0.57       2.5 +/-    0.57  0.030 / 0.040