PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/18-14:28:00
G02     57.0           34.4                5.8 +/-    0.76       9.3 +/-    0.76  0.030 / 0.040
G05     67.4           65.8                8.2 +/-    0.52       8.9 +/-    0.52  0.030 / 0.030
G12     187.2          38.3               10.0 +/-    1.39      14.9 +/-    1.39  0.050 / 0.070
G13     132.8          12.2               12.9 +/-    2.02      34.2 +/-    2.02  0.040 / 0.060
G20     206.5          53.7               10.9 +/-    1.60      13.2 +/-    1.60  0.130 / 0.280
G21     269.1          18.1                5.5 +/-    1.51      12.8 +/-    1.51  0.140 / 0.250
G25     242.1          54.5                8.6 +/-    1.34      10.3 +/-    1.34  0.090 / 0.060
G29     330.0          55.7                6.6 +/-    0.42       7.8 +/-    0.42  0.050 / 0.090