PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/28-18:27:50
G02     39.9           49.9                9.0 +/-    1.17      11.4 +/-    1.17  0.030 / 0.020
G05     116.2          68.8                9.7 +/-    1.34      10.3 +/-    1.34  0.030 / 0.020
G12     184.5          52.1                8.8 +/-    0.52      10.9 +/-    0.52  0.030 / 0.050
G25     276.3          58.7               12.3 +/-    0.88      14.2 +/-    0.88  0.040 / 0.050
G29     313.7          34.6                8.2 +/-    1.51      13.1 +/-    1.51  0.040 / 0.050