PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-05:12:30
G01     88.0           32.2                4.0 +/-    1.66       6.7 +/-    1.66  0.060 / 0.040
G07     127.2          43.4                7.6 +/-    0.66      10.5 +/-    0.66  0.060 / 0.050
G11     67.5           39.1                3.9 +/-    1.29       5.7 +/-    1.29  0.040 / 0.040
G13     293.7          35.7                4.2 +/-    2.99       6.6 +/-    2.99  0.040 / 0.030
G15     313.7          11.3               -1.5 +/-   12.46      -4.0 +/-   12.46  0.130 / 0.210
G17     216.1          56.3                7.1 +/-    0.80       8.4 +/-    0.80  0.300 / 0.220
G19     215.4          29.9                6.1 +/-    2.75      10.7 +/-    2.75  0.080 / 0.080
G28     354.4          61.5                3.6 +/-    0.94       4.1 +/-    0.94  0.080 / 0.080
G30     111.6          72.7                6.0 +/-    0.76       6.2 +/-    0.76  0.070 / 0.080