PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/23-21:27:50
G01     250.0          34.7               12.2 +/-    1.55      19.4 +/-    1.55  0.040 / 0.040
G03     315.7          45.0                8.6 +/-    0.83      11.6 +/-    0.83  0.040 / 0.030
G11     237.2          12.3               11.3 +/-    2.79      30.0 +/-    2.79  0.030 / 0.030
G14     61.5           40.2                7.2 +/-    1.30      10.4 +/-    1.30  0.050 / 0.030
G22     303.7          66.6                9.3 +/-    0.82      10.0 +/-    0.82  0.080 / 0.110
G23     287.2          19.6                9.5 +/-    1.51      21.1 +/-    1.51  0.070 / 0.110
G26     137.2          38.3               12.9 +/-    0.82      19.3 +/-    0.82  0.060 / 0.090
G31     40.2           59.0                8.7 +/-    0.62       9.9 +/-    0.62  0.050 / 0.070
G32     78.0           22.8                7.6 +/-    1.25      15.6 +/-    1.25  0.120 / 0.160