PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-09:12:50
G01     122.4          15.4                5.6 +/-    1.58      13.9 +/-    1.58  0.040 / 0.040
G07     71.9           67.7                5.7 +/-    0.62       6.1 +/-    0.62  0.020 / 0.030
G08     46.0           33.0                4.0 +/-    1.67       6.5 +/-    1.67  0.200 / 0.340
G09     174.0          25.5                6.6 +/-    3.20      12.8 +/-    3.20  0.190 / 0.320
G11     110.0          38.5                7.0 +/-    2.03      10.5 +/-    2.03  0.050 / 0.030
G13     319.2          16.7                2.5 +/-    2.41       6.0 +/-    2.41  0.040 / 0.030
G17     200.2          22.2                2.4 +/-    2.05       5.0 +/-    2.05  0.150 / 0.310
G18     96.7           19.2                4.6 +/-    1.28      10.4 +/-    1.28  0.180 / 0.240
G28     284.5          55.1                3.3 +/-    2.65       3.9 +/-    2.65  0.090 / 0.190
G30     337.7          64.2                3.9 +/-    1.04       4.3 +/-    1.04  0.090 / 0.250