PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/20-21:57:50
G01     220.9          11.9                7.5 +/-    3.40      20.1 +/-    3.40  0.190 / 0.280
G03     265.3          70.2                8.7 +/-    0.92       9.2 +/-    0.92  0.160 / 0.300
G09     299.1          14.1                7.5 +/-    1.08      18.9 +/-    1.08  0.120 / 0.220
G14     93.1           18.9                7.9 +/-    1.98      17.7 +/-    1.98  0.130 / 0.220
G16     140.6          51.4               10.9 +/-    0.88      13.6 +/-    0.88  0.040 / 0.040
G22     204.1          63.9                9.7 +/-    0.36      10.7 +/-    0.36  0.050 / 0.040
G23     311.6          40.9                8.1 +/-    1.45      11.6 +/-    1.45  0.040 / 0.060
G26     87.5           55.6                9.4 +/-    0.78      11.2 +/-    0.78  0.040 / 0.060
G31     47.2           29.7                6.8 +/-    1.30      11.9 +/-    1.30  0.080 / 0.080