PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-12:28:00
G02     59.7           31.8                4.1 +/-    0.72       6.9 +/-    0.72  0.030 / 0.030
G05     60.4           62.4                4.1 +/-    0.41       4.6 +/-    0.41  0.040 / 0.030
G12     186.7          35.2                6.4 +/-    1.16      10.2 +/-    1.16  0.100 / 0.070
G13     130.3          14.2                5.3 +/-    3.15      13.5 +/-    3.15  0.060 / 0.080
G15     163.3          11.7                3.4 +/-    5.52       9.2 +/-    5.52  0.040 / 0.050
G20     208.6          55.8                6.7 +/-    0.54       7.9 +/-    0.54  0.040 / 0.040
G21     272.1          21.0                1.8 +/-    2.02       3.8 +/-    2.02  0.060 / 0.100
G25     238.6          52.6                6.3 +/-    3.58       7.7 +/-    3.58  0.060 / 0.050
G29     330.8          57.1                3.3 +/-    0.67       3.8 +/-    0.67  0.030 / 0.030