PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/20-14:27:50
G02     59.9           31.9                5.7 +/-    1.29       9.6 +/-    1.29  0.030 / 0.030
G05     60.5           63.0                7.4 +/-    0.80       8.2 +/-    0.80  0.040 / 0.030
G12     186.4          34.4                9.5 +/-    1.23      15.3 +/-    1.23  0.190 / 0.180
G13     130.1          14.6               11.8 +/-    3.27      29.7 +/-    3.27  0.110 / 0.360
G15     163.2          12.0                9.1 +/-    3.80      24.3 +/-    3.80  0.050 / 0.080
G20     208.3          57.6                9.6 +/-    0.51      11.1 +/-    0.51  0.060 / 0.060
G21     272.1          20.4                6.6 +/-    1.16      14.4 +/-    1.16  0.040 / 0.040
G25     236.4          52.1                9.3 +/-    3.48      11.5 +/-    3.48  0.040 / 0.040
G29     332.8          59.0                5.7 +/-    0.53       6.5 +/-    0.53  0.250 / 0.350