PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/23-03:57:50
G01     54.3           28.0                1.4 +/-    2.80       2.6 +/-    2.80  0.050 / 0.050
G06     181.1          17.9                5.1 +/-    1.82      11.8 +/-    1.82  0.050 / 0.040
G07     144.7          16.8                4.9 +/-    1.49      11.7 +/-    1.49  0.080 / 0.100
G11     46.6           20.4                2.4 +/-    2.51       5.3 +/-    2.51  0.090 / 0.130
G13     256.8          32.7                1.1 +/-    2.30       1.8 +/-    2.30  0.110 / 0.220
G15     287.4          16.6                3.8 +/-    1.58       9.0 +/-    1.58  0.160 / 0.270
G17     286.1          78.5                3.9 +/-    0.73       4.0 +/-    0.73  0.020 / 0.030
G19     240.3          56.8                4.4 +/-    2.84       5.2 +/-    2.84  0.030 / 0.020
G28     46.3           54.3                3.4 +/-    0.76       4.1 +/-    0.76  0.170 / 0.100
G30     146.4          42.8                5.9 +/-    0.84       8.2 +/-    0.84  0.120 / 0.090