PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/18-21:27:30
G02     45.9           44.7                9.1 +/-    0.34      12.3 +/-    0.34  0.030 / 0.040
G05     95.7           69.4               10.0 +/-    0.38      10.6 +/-    0.38  0.030 / 0.040
G12     185.3          47.3               12.5 +/-    2.39      16.4 +/-    2.39  0.060 / 0.090
G25     265.7          58.5               11.1 +/-    1.10      12.8 +/-    1.10  0.050 / 0.070
G29     317.4          39.3                9.8 +/-    1.38      14.4 +/-    1.38  0.040 / 0.050