PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/30-09:13:10
G01     127.6          11.1               -2.1 +/-   32.25      -5.6 +/-   32.25  0.100 / 0.080
G07     54.6           68.6                4.4 +/-    0.36       4.7 +/-    0.36  0.060 / 0.090
G08     50.4           38.7                4.2 +/-    1.07       6.2 +/-    1.07  0.030 / 0.040
G09     177.0          35.8                5.7 +/-    1.29       8.9 +/-    1.29  0.020 / 0.040
G11     117.5          33.8                7.1 +/-    1.43      11.5 +/-    1.43  0.050 / 0.080
G17     199.1          16.1                4.2 +/-    2.76      10.1 +/-    2.76  0.040 / 0.090
G23     161.2          10.1                4.2 +/-    4.25      11.8 +/-    4.25  0.160 / 0.330
G28     275.5          52.7                5.1 +/-    0.92       6.2 +/-    0.92  0.170 / 0.340
G30     330.9          58.7                3.0 +/-    0.61       3.5 +/-    0.61  0.040 / 0.060