PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/13-12:57:30
G02     61.6           30.2                3.7 +/-    0.51       6.4 +/-    0.51  0.020 / 0.030
G05     57.1           60.6                3.9 +/-    0.80       4.4 +/-    0.80  0.030 / 0.040
G12     186.1          32.6                5.6 +/-    0.84       9.3 +/-    0.84  0.110 / 0.210
G13     128.5          15.9                5.9 +/-    1.44      14.4 +/-    1.44  0.070 / 0.200
G15     162.0          13.6                4.2 +/-    1.67      10.8 +/-    1.67  0.040 / 0.060
G20     209.9          58.7                7.4 +/-    1.05       8.5 +/-    1.05  0.050 / 0.050
G21     274.2          22.7                3.6 +/-    3.07       7.4 +/-    3.07  0.130 / 0.090
G25     234.8          50.9                6.1 +/-    0.88       7.7 +/-    0.88  0.080 / 0.120
G29     333.0          59.7                1.8 +/-    0.79       2.1 +/-    0.79  0.140 / 0.190