PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/20-07:57:50
G01     64.5           31.8                4.3 +/-    1.12       7.2 +/-    1.12  0.060 / 0.030
G07     140.3          25.1                5.9 +/-    1.32      11.5 +/-    1.32  0.050 / 0.040
G11     50.4           26.3                3.0 +/-    1.95       5.6 +/-    1.95  0.080 / 0.100
G13     269.4          36.1                6.3 +/-    1.68       9.7 +/-    1.68  0.080 / 0.100
G15     297.5          16.4                4.4 +/-    1.35      10.5 +/-    1.35  0.110 / 0.240
G17     248.5          75.2                6.2 +/-    0.29       6.4 +/-    0.29  0.110 / 0.180
G19     229.1          48.6                5.9 +/-    2.52       7.5 +/-    2.52  0.030 / 0.020
G28     30.1           57.5                3.8 +/-    0.88       4.4 +/-    0.88  0.030 / 0.020
G30     140.1          55.8                7.9 +/-    0.47       9.3 +/-    0.47  0.050 / 0.070