PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/28-05:27:50
G01     61.8           31.1                3.6 +/-    0.72       6.2 +/-    0.72  0.040 / 0.050
G07     141.5          23.4                6.4 +/-    2.21      13.0 +/-    2.21  0.030 / 0.040
G11     49.6           25.5                3.8 +/-    1.80       7.4 +/-    1.80  0.020 / 0.020
G13     265.9          35.5                5.0 +/-    1.63       7.9 +/-    1.63  0.030 / 0.020
G15     294.7          16.7                1.8 +/-    0.79       4.2 +/-    0.79  0.100 / 0.180
G17     255.0          75.9                5.0 +/-    0.36       5.1 +/-    0.36  0.120 / 0.160
G19     231.5          50.5                5.4 +/-    1.89       6.8 +/-    1.89  0.050 / 0.080
G28     34.4           56.8                4.2 +/-    1.11       5.0 +/-    1.11  0.050 / 0.080
G30     141.9          51.6                6.5 +/-    0.58       8.0 +/-    0.58  0.080 / 0.100