PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/15-11:57:20
G02     43.4           46.4                5.5 +/-    0.45       7.3 +/-    0.45  0.030 / 0.040
G05     117.1          68.5                9.1 +/-    0.52       9.7 +/-    0.52  0.020 / 0.040
G06     57.9           13.5                3.6 +/-    0.78       9.4 +/-    0.78  0.030 / 0.040
G12     193.9          58.0               10.9 +/-    1.63      12.6 +/-    1.63  0.030 / 0.040
G20     201.2          34.0               13.0 +/-    0.95      21.1 +/-    0.95  0.060 / 0.040
G25     279.1          58.0                9.2 +/-    0.63      10.7 +/-    0.63  0.050 / 0.050
G29     316.4          39.2                5.6 +/-    0.72       8.2 +/-    0.72  0.070 / 0.120