PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/20-08:58:00
G01     41.8           17.1                2.9 +/-    1.19       6.8 +/-    1.19  0.050 / 0.070
G06     178.3          35.0                8.0 +/-    0.94      12.7 +/-    0.94  0.050 / 0.070
G13     240.1          22.8                4.9 +/-    2.28      10.1 +/-    2.28  0.180 / 0.210
G15     271.7          12.9                4.8 +/-    1.41      12.6 +/-    1.41  0.160 / 0.160
G17     3.6            70.3                5.6 +/-    0.58       5.9 +/-    0.58  0.090 / 0.190
G19     278.0          69.8                5.4 +/-    0.75       5.7 +/-    0.75  0.110 / 0.190
G24     317.5          17.1                4.5 +/-    2.41      10.7 +/-    2.41  0.030 / 0.030
G28     71.0           46.8                3.7 +/-    0.43       4.9 +/-    0.43  0.030 / 0.030
G30     154.0          28.1                7.0 +/-    0.91      12.8 +/-    0.91  0.120 / 0.160