PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/31-04:28:00
G02     37.4           51.8                5.3 +/-    0.91       6.5 +/-    0.91  0.030 / 0.040
G05     130.1          64.6                6.4 +/-    0.46       7.0 +/-    0.46  0.040 / 0.040
G06     55.1           14.5                3.6 +/-    3.72       9.2 +/-    3.72  0.030 / 0.030
G12     198.0          65.5                6.1 +/-    0.49       6.7 +/-    0.49  0.030 / 0.030
G20     205.6          12.5                5.1 +/-    3.26      13.4 +/-    3.26  0.080 / 0.240
G25     294.0          54.2                4.8 +/-    2.59       5.8 +/-    2.59  0.240 / 0.420
G29     309.3          30.0                4.5 +/-    0.83       7.9 +/-    0.83  0.040 / 0.040