PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-06:28:00
G10     255.6          30.4                5.9 +/-    1.17      10.2 +/-    1.17  0.120 / 0.490
G13     49.1           26.8                5.6 +/-    1.68      10.6 +/-    1.68  0.100 / 0.390
G15     74.7           55.3                7.8 +/-    0.68       9.2 +/-    0.68  0.040 / 0.060
G16     289.7          14.9                3.3 +/-    1.96       8.2 +/-    1.96  0.050 / 0.040
G20     351.4          70.2                5.8 +/-    0.68       6.1 +/-    0.68  0.070 / 0.040
G21     341.3          64.2                4.9 +/-    0.54       5.4 +/-    0.54  0.060 / 0.050
G26     261.4          13.2                5.5 +/-    1.82      14.3 +/-    1.82  0.060 / 0.020
G27     322.2          10.1              -16.0 +/-   10.20     -44.5 +/-   10.20  0.070 / 0.030
G29     166.3          43.8                8.5 +/-    0.69      11.6 +/-    0.69  0.050 / 0.050