PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/20-08:58:00
G01     102.3          26.6                4.9 +/-    0.86       9.2 +/-    0.86  0.030 / 0.040
G07     112.0          54.2                6.0 +/-    0.59       7.2 +/-    0.59  0.030 / 0.040
G08     41.9           20.0                3.5 +/-    2.22       7.6 +/-    2.22  0.050 / 0.070
G09     173.6          10.6                2.6 +/-    6.26       7.3 +/-    6.26  0.050 / 0.080
G11     86.2           44.4                6.1 +/-    1.16       8.2 +/-    1.16  0.250 / 0.510
G13     306.4          31.7                4.7 +/-    1.23       8.0 +/-    1.23  0.200 / 0.460
G17     206.6          38.7                5.9 +/-    0.91       8.8 +/-    0.91  0.330 / 0.230
G18     76.3           24.6                5.6 +/-    1.47      11.0 +/-    1.47  0.180 / 0.280
G28     309.5          58.6                4.0 +/-    0.70       4.6 +/-    0.70  0.030 / 0.020
G30     28.0           79.5                4.7 +/-    0.87       4.8 +/-    0.87  0.030 / 0.020