PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/21-13:27:50
G01     57.3           29.4                5.5 +/-    2.47       9.7 +/-    2.47  0.040 / 0.040
G07     143.4          19.6                5.8 +/-    1.67      13.0 +/-    1.67  0.040 / 0.040
G11     46.6           20.3                5.5 +/-    2.64      12.1 +/-    2.64  0.100 / 0.200
G13     258.8          34.3                8.6 +/-    0.67      13.9 +/-    0.67  0.110 / 0.250
G15     294.7          14.9                3.3 +/-    1.52       8.3 +/-    1.52  0.070 / 0.140
G17     278.0          79.2                7.6 +/-    0.75       7.7 +/-    0.75  0.130 / 0.150
G18     40.3           10.6                5.2 +/-    2.63      14.4 +/-    2.63  0.080 / 0.070
G19     234.6          49.4                6.9 +/-    1.71       8.8 +/-    1.71  0.070 / 0.070
G28     39.8           55.9                5.5 +/-    0.77       6.5 +/-    0.77  0.110 / 0.420
G30     146.0          51.3                7.2 +/-    0.67       8.9 +/-    0.67  0.150 / 0.440