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                3.1 +/-    1.59       7.3 +/-    1.59  0.040 / 0.060
G06     178.3          35.0                6.3 +/-    0.58      10.0 +/-    0.58  0.050 / 0.100
G13     240.1          22.8                6.8 +/-    1.61      14.1 +/-    1.61  0.280 / 0.330
G15     271.7          12.9                4.0 +/-    1.32      10.4 +/-    1.32  0.200 / 0.280
G17     3.6            70.3                5.2 +/-    0.34       5.5 +/-    0.34  0.110 / 0.200
G19     278.0          69.8                5.1 +/-    0.67       5.4 +/-    0.67  0.140 / 0.200
G24     317.5          17.1                2.4 +/-    5.01       5.7 +/-    5.01  0.030 / 0.020
G28     71.0           46.8                5.0 +/-    1.10       6.6 +/-    1.10  0.030 / 0.020
G30     154.0          28.1                7.0 +/-    1.24      12.8 +/-    1.24  0.060 / 0.090