PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-02:12:30
G07     317.9          51.7                3.5 +/-    0.66       4.3 +/-    0.66  0.240 / 0.270
G08     116.7          46.9                7.8 +/-    0.59      10.3 +/-    0.59  0.210 / 0.340
G09     247.3          82.8                5.6 +/-    0.90       5.6 +/-    0.90  0.200 / 0.230
G16     43.2           20.0                3.0 +/-    2.01       6.5 +/-    2.01  0.130 / 0.300
G23     150.6          54.8                7.7 +/-    0.92       9.2 +/-    0.92  0.050 / 0.050
G27     66.6           35.5                5.1 +/-    1.19       8.1 +/-    1.19  0.040 / 0.040
G28     229.4          20.9                3.8 +/-    2.65       8.2 +/-    2.65  0.060 / 0.050
G30     293.6          29.1                1.4 +/-    1.22       2.5 +/-    1.22  0.060 / 0.050