PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/07-07:58:00
G02     36.7           52.5                1.8 +/-    0.66       2.3 +/-    0.66  0.020 / 0.040
G05     134.1          63.5                5.4 +/-    0.61       6.0 +/-    0.61  0.030 / 0.040
G06     53.8           17.4                0.8 +/-    1.17       1.8 +/-    1.17  0.030 / 0.030
G12     201.4          67.4                1.4 +/-    0.46       1.5 +/-    0.46  0.030 / 0.040
G20     200.7          23.3                2.3 +/-    1.61       4.7 +/-    1.61  0.080 / 0.200
G25     295.7          53.7                2.9 +/-    0.84       3.5 +/-    0.84  0.110 / 0.200
G29     309.2          30.5                1.4 +/-    1.19       2.4 +/-    1.19  0.050 / 0.050