PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/15-08:28:00
G02     59.0           32.2                1.9 +/-    1.61       3.1 +/-    1.61  0.030 / 0.030
G05     60.8           61.9                4.1 +/-    0.68       4.6 +/-    0.68  0.040 / 0.030
G12     186.7          36.4                6.3 +/-    1.83       9.8 +/-    1.83  0.050 / 0.040
G13     130.9          13.5                5.2 +/-    3.01      13.5 +/-    3.01  0.040 / 0.060
G15     163.9          10.9               -1.8 +/-   15.40      -4.9 +/-   15.40  0.070 / 0.080
G20     209.3          51.7                7.6 +/-    0.81       9.4 +/-    0.81  0.070 / 0.090
G21     270.1          17.7                4.5 +/-    2.25      10.4 +/-    2.25  0.120 / 0.160
G25     241.9          53.5                5.9 +/-    4.38       7.2 +/-    4.38  0.140 / 0.190
G29     327.9          53.7                2.5 +/-    1.71       3.0 +/-    1.71  0.210 / 0.320