PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/20-07:57:30
G02     344.5          79.6                4.0 +/-    0.43       4.1 +/-    0.43  0.070 / 0.090
G05     164.9          31.5                6.8 +/-    1.21      11.6 +/-    1.21  0.090 / 0.070
G06     40.0           46.4                2.3 +/-    1.06       3.0 +/-    1.06  0.230 / 0.240
G12     315.0          66.9                4.4 +/-    0.73       4.7 +/-    0.73  0.200 / 0.170
G17     84.3           13.0                5.5 +/-    1.66      14.3 +/-    1.66  0.030 / 0.030
G19     73.5           28.1                4.4 +/-    2.04       7.9 +/-    2.04  0.030 / 0.030
G24     231.3          24.7                3.8 +/-    2.04       7.5 +/-    2.04  0.220 / 0.140
G25     317.7          26.3                2.8 +/-    1.45       5.3 +/-    1.45  0.080 / 0.160