PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/21-21:57:40
G01     219.7          10.7               10.2 +/-    2.31      27.9 +/-    2.31  0.170 / 0.330
G03     259.0          70.2                7.2 +/-    0.68       7.6 +/-    0.68  0.320 / 0.370
G09     300.2          15.4                5.0 +/-    3.17      12.3 +/-    3.17  0.030 / 0.040
G14     94.7           17.8                8.2 +/-    0.81      19.1 +/-    0.81  0.040 / 0.050
G16     138.5          53.1               10.1 +/-    0.69      12.3 +/-    0.69  0.050 / 0.070
G22     201.8          62.1                8.2 +/-    1.40       9.1 +/-    1.40  0.040 / 0.060
G23     312.9          42.2                6.8 +/-    1.99       9.5 +/-    1.99  0.110 / 0.280
G26     84.1           55.4                6.5 +/-    0.68       7.7 +/-    0.68  0.120 / 0.400
G31     48.0           28.3                4.1 +/-    0.38       7.5 +/-    0.38  0.030 / 0.040