PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/27-06:57:50
G02     44.6           45.1                2.8 +/-    0.40       3.7 +/-    0.40  0.030 / 0.040
G05     107.9          68.5                4.3 +/-    0.77       4.6 +/-    0.77  0.030 / 0.040
G12     192.6          56.4                6.5 +/-    0.55       7.7 +/-    0.55  0.070 / 0.150
G20     203.0          32.1                4.6 +/-    1.82       7.8 +/-    1.82  0.070 / 0.170
G25     278.3          57.6                4.8 +/-    1.17       5.5 +/-    1.17  0.030 / 0.040
G29     315.5          37.5                2.9 +/-    1.06       4.4 +/-    1.06  0.030 / 0.050