PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/17-07:27:50
G02     199.1          17.1                4.8 +/-    2.49      11.4 +/-    2.49  0.050 / 0.090
G06     178.1          43.6                8.1 +/-    1.56      11.2 +/-    1.56  0.040 / 0.090
G13     232.3          16.7                4.6 +/-    1.86      11.0 +/-    1.86  0.100 / 0.180
G17     16.7           63.4                3.5 +/-    0.49       3.9 +/-    0.49  0.110 / 0.170
G19     309.0          71.8                4.9 +/-    0.69       5.1 +/-    0.69  0.030 / 0.040
G24     313.9          24.6                4.6 +/-    2.86       9.1 +/-    2.86  0.020 / 0.040
G28     82.6           42.1                5.4 +/-    0.94       7.6 +/-    0.94  0.050 / 0.050
G30     155.8          18.1                7.2 +/-    1.46      16.6 +/-    1.46  0.040 / 0.070