PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/31-03:57:40
G01     43.1           19.0                2.3 +/-    1.20       5.2 +/-    1.20  0.020 / 0.030
G06     178.1          33.0                4.6 +/-    1.68       7.6 +/-    1.68  0.020 / 0.030
G13     241.7          24.3                4.3 +/-    1.57       8.6 +/-    1.57  0.040 / 0.060
G15     273.3          13.7                3.8 +/-    1.14       9.8 +/-    1.14  0.040 / 0.070
G17     350.8          73.4                3.6 +/-    0.66       3.7 +/-    0.66  0.200 / 0.410
G19     269.1          67.8                4.3 +/-    0.56       4.6 +/-    0.56  0.170 / 0.390
G24     317.9          15.5                1.5 +/-    1.85       3.7 +/-    1.85  0.070 / 0.130
G28     67.7           48.0                2.8 +/-    0.62       3.7 +/-    0.62  0.070 / 0.120
G30     152.5          27.6                7.1 +/-    1.91      13.2 +/-    1.91  0.090 / 0.190