PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-20:27:40
G01     297.3          38.2                9.6 +/-    1.58      14.3 +/-    1.58  0.050 / 0.090
G03     310.0          12.9                8.9 +/-    2.73      23.2 +/-    2.73  0.060 / 0.090
G10     115.2          33.5               13.9 +/-    0.69      22.7 +/-    0.69  0.020 / 0.030
G11     271.8          27.4               10.2 +/-    1.26      18.9 +/-    1.26  0.020 / 0.020
G14     15.9           61.8                9.3 +/-    0.78      10.5 +/-    0.78  0.070 / 0.120
G22     312.5          33.2                7.8 +/-    1.29      12.7 +/-    1.29  0.080 / 0.150
G25     72.1           18.5                9.8 +/-    1.96      22.4 +/-    1.96  0.030 / 0.040
G31     156.9          74.2               10.5 +/-    0.49      10.9 +/-    0.49  0.030 / 0.040
G32     45.3           46.3                8.5 +/-    0.79      11.3 +/-    0.79  0.040 / 0.050