PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/22-12:13:00
G02     58.8           32.5                2.5 +/-    1.01       4.2 +/-    1.01  0.040 / 0.030
G05     62.3           63.3                3.0 +/-    0.65       3.3 +/-    0.65  0.030 / 0.030
G12     187.0          36.5                3.2 +/-    0.96       4.9 +/-    0.96  0.040 / 0.050
G13     131.2          13.4                4.7 +/-    2.27      12.1 +/-    2.27  0.050 / 0.040
G15     163.9          10.8               -3.9 +/-   14.41     -10.8 +/-   14.41  0.090 / 0.050
G20     208.1          54.3                4.4 +/-    0.97       5.3 +/-    0.97  0.060 / 0.070
G21     271.0          20.1                2.7 +/-    2.58       6.0 +/-    2.58  0.140 / 0.310
G25     240.6          53.4                4.8 +/-    4.20       5.9 +/-    4.20  0.130 / 0.240
G29     329.8          55.8                1.6 +/-    1.09       1.9 +/-    1.09  0.080 / 0.080