PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-19:27:40
G01     315.4          24.6                8.8 +/-    2.32      17.3 +/-    2.32  0.180 / 0.260
G10     91.5           48.8                7.8 +/-    1.10      10.0 +/-    1.10  0.240 / 0.280
G11     295.8          25.9                9.4 +/-    2.17      18.0 +/-    2.17  0.180 / 0.200
G14     324.3          70.8                8.4 +/-    0.42       8.8 +/-    0.42  0.180 / 0.250
G18     109.3          21.5                8.1 +/-    1.11      17.1 +/-    1.11  0.040 / 0.040
G22     304.5          16.2                8.1 +/-    1.47      19.7 +/-    1.47  0.060 / 0.040
G25     93.6           12.2                9.0 +/-    3.68      23.9 +/-    3.68  0.060 / 0.020
G31     175.4          50.2               10.2 +/-    1.18      12.8 +/-    1.18  0.040 / 0.020
G32     20.2           61.8                7.8 +/-    0.67       8.7 +/-    0.67  0.060 / 0.040