PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/31-09:28:00
G02     58.5           32.7                2.9 +/-    1.06       4.9 +/-    1.06  0.040 / 0.060
G05     62.1           62.7                4.5 +/-    0.44       5.0 +/-    0.44  0.040 / 0.070
G12     187.0          37.1                6.4 +/-    1.18       9.8 +/-    1.18  0.030 / 0.030
G13     131.4          13.1                4.4 +/-    2.68      11.5 +/-    2.68  0.030 / 0.040
G15     164.1          10.5               -4.1 +/-   20.04     -11.4 +/-   20.04  0.110 / 0.310
G20     208.6          51.8                5.9 +/-    0.93       7.3 +/-    0.93  0.100 / 0.300
G21     269.8          17.9                4.9 +/-    1.69      11.3 +/-    1.69  0.060 / 0.080
G25     242.7          53.8                6.9 +/-    1.11       8.3 +/-    1.11  0.060 / 0.080
G29     328.0          53.7                2.5 +/-    0.90       3.0 +/-    0.90  0.040 / 0.080