PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/21-15:28:10
G01     311.4          29.5                5.6 +/-    0.73      10.0 +/-    0.73  0.110 / 0.110
G10     100.0          44.2                6.2 +/-    0.90       8.4 +/-    0.90  0.110 / 0.100
G11     290.9          26.3                6.6 +/-    2.51      12.5 +/-    2.51  0.030 / 0.050
G14     338.5          69.3                4.4 +/-    0.58       4.7 +/-    0.58  0.030 / 0.050
G22     308.0          23.1                6.1 +/-    2.04      12.4 +/-    2.04  0.180 / 0.250
G25     88.2           14.9                7.3 +/-    2.80      18.2 +/-    2.80  0.160 / 0.240
G31     169.5          59.7                6.5 +/-    0.46       7.4 +/-    0.46  0.030 / 0.030
G32     31.0           55.8                4.5 +/-    0.82       5.3 +/-    0.82  0.040 / 0.040