PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/30-09:27:50
G02     57.1           33.9                3.1 +/-    2.37       5.1 +/-    2.37  0.030 / 0.030
G05     65.4           64.1                4.9 +/-    0.48       5.4 +/-    0.48  0.030 / 0.040
G12     187.4          39.1                9.0 +/-    0.72      13.3 +/-    0.72  0.060 / 0.060
G13     132.8          11.8                6.1 +/-    1.87      16.4 +/-    1.87  0.050 / 0.050
G20     207.7          49.9                8.2 +/-    0.74      10.4 +/-    0.74  0.150 / 0.300
G21     268.4          16.9                5.3 +/-    1.47      12.6 +/-    1.47  0.190 / 0.240
G25     245.8          54.9                5.7 +/-    1.40       6.8 +/-    1.40  0.040 / 0.060
G29     326.7          52.0                4.3 +/-    1.44       5.3 +/-    1.44  0.050 / 0.050