PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/23-22:57:30
G03     243.5          68.9                7.5 +/-    1.24       8.0 +/-    1.24  0.040 / 0.040
G09     302.2          16.3                6.4 +/-    1.36      15.4 +/-    1.36  0.040 / 0.040
G14     98.4           15.5                8.8 +/-    1.06      21.7 +/-    1.06  0.030 / 0.040
G16     136.4          56.9               11.2 +/-    0.74      13.0 +/-    0.74  0.030 / 0.040
G22     197.2          57.9                9.4 +/-    0.36      10.9 +/-    0.36  0.120 / 0.220
G23     317.4          47.1                7.4 +/-    0.82       9.7 +/-    0.82  0.140 / 0.180
G26     74.2           53.7                8.0 +/-    0.90       9.7 +/-    0.90  0.130 / 0.260
G31     50.8           22.4                5.6 +/-    3.07      11.7 +/-    3.07  0.170 / 0.190