PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-05:27:40
G01     79.5           33.2                3.3 +/-    1.10       5.5 +/-    1.10  0.040 / 0.040
G07     132.7          37.2                7.6 +/-    0.58      11.6 +/-    0.58  0.040 / 0.040
G11     60.3           35.6                4.2 +/-    0.89       6.6 +/-    0.89  0.040 / 0.030
G13     285.3          37.0                4.3 +/-    1.08       6.5 +/-    1.08  0.050 / 0.040
G15     308.3          13.9                0.2 +/-    2.07       0.6 +/-    2.07  0.080 / 0.160
G17     223.1          63.1                6.8 +/-    1.05       7.6 +/-    1.05  0.110 / 0.230
G19     219.3          36.5                6.7 +/-    1.85      10.4 +/-    1.85  0.060 / 0.080
G28     7.7            60.5                4.1 +/-    1.50       4.6 +/-    1.50  0.050 / 0.090
G30     125.7          66.7                7.1 +/-    0.55       7.6 +/-    0.55  0.080 / 0.070