PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-09:27:50
G01     116.7          19.6                5.2 +/-    1.49      11.6 +/-    1.49  0.030 / 0.040
G07     88.6           64.4                5.5 +/-    0.76       6.1 +/-    0.76  0.040 / 0.040
G08     43.4           27.2                2.1 +/-    0.71       3.9 +/-    0.71  0.030 / 0.040
G09     173.3          18.9                5.4 +/-    3.01      12.2 +/-    3.01  0.030 / 0.040
G11     101.3          41.0                6.8 +/-    1.31       9.7 +/-    1.31  0.120 / 0.160
G13     316.1          21.9               -0.9 +/-    2.95      -1.9 +/-    2.95  0.120 / 0.190
G17     201.7          29.0                4.6 +/-    2.10       8.1 +/-    2.10  0.150 / 0.260
G18     89.8           21.7                6.5 +/-    1.51      13.7 +/-    1.51  0.160 / 0.300
G28     296.3          57.9                4.1 +/-    1.38       4.7 +/-    1.38  0.070 / 0.280
G30     347.9          69.9                2.8 +/-    0.61       2.9 +/-    0.61  0.080 / 0.220