PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-11:57:40
G01     127.4          11.2                1.3 +/-   24.50       3.5 +/-   24.50  0.030 / 0.040
G07     57.6           68.0                4.3 +/-    0.71       4.6 +/-    0.71  0.050 / 0.050
G08     50.1           38.3                3.5 +/-    0.73       5.2 +/-    0.73  0.020 / 0.040
G09     175.9          34.3                6.2 +/-    1.29      10.0 +/-    1.29  0.020 / 0.040
G11     116.3          33.8                4.8 +/-    1.10       7.9 +/-    1.10  0.090 / 0.160
G17     199.1          16.5                5.5 +/-    1.94      13.1 +/-    1.94  0.080 / 0.150
G28     275.7          52.6                5.5 +/-    0.65       6.8 +/-    0.65  0.140 / 0.300
G30     330.0          58.1                3.0 +/-    0.56       3.5 +/-    0.56  0.130 / 0.360