PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/23-12:27:30
G01     220.7          11.3                4.4 +/-    1.80      11.9 +/-    1.80  0.110 / 0.160
G03     258.2          70.5                5.3 +/-    0.83       5.6 +/-    0.83  0.090 / 0.170
G14     92.0           23.0                6.8 +/-    2.68      13.9 +/-    2.68  0.190 / 0.370
G16     134.9          53.7                8.3 +/-    0.42      10.0 +/-    0.42  0.160 / 0.480
G22     195.0          60.6                6.9 +/-    0.33       7.8 +/-    0.33  0.040 / 0.040
G23     316.5          47.0                5.8 +/-    0.68       7.6 +/-    0.68  0.040 / 0.040
G26     78.5           52.9                6.4 +/-    0.88       7.8 +/-    0.88  0.050 / 0.060
G31     49.4           23.2                4.5 +/-    1.60       9.2 +/-    1.60  0.040 / 0.060