PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/12-08:28:00
G05     47.4           19.9                2.3 +/-    3.97       5.0 +/-    3.97  0.230 / 0.280
G13     83.6           36.7                6.3 +/-    1.03       9.7 +/-    1.03  0.170 / 0.250
G15     129.7          48.8                7.7 +/-    1.08       9.9 +/-    1.08  0.080 / 0.070
G20     352.9          78.4                3.5 +/-    0.52       3.5 +/-    0.52  0.050 / 0.080
G21     309.0          44.6                2.9 +/-    1.48       4.0 +/-    1.48  0.040 / 0.040
G25     203.0          15.5                4.1 +/-    1.82      10.1 +/-    1.82  0.040 / 0.040
G26     292.6          20.7                5.5 +/-    1.17      11.9 +/-    1.17  0.060 / 0.080
G29     149.0          77.6                5.0 +/-    0.40       5.1 +/-    0.40  0.050 / 0.080