PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/20-06:58:00
G02     54.1           36.7                3.7 +/-    1.07       5.8 +/-    1.07  0.210 / 0.480
G05     71.1           66.1                4.5 +/-    0.66       4.8 +/-    0.66  0.300 / 0.270
G12     187.9          42.7                6.1 +/-    0.45       8.5 +/-    0.45  0.060 / 0.060
G13     133.1          10.1               -2.3 +/-   17.78      -6.3 +/-   17.78  0.050 / 0.060
G21     267.3          16.6                4.2 +/-    2.47      10.1 +/-    2.47  0.040 / 0.050
G25     243.6          56.4                5.2 +/-    1.44       6.2 +/-    1.44  0.050 / 0.050
G29     327.1          51.7                4.4 +/-    0.94       5.4 +/-    0.94  0.150 / 0.390