PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-06:58:10
G10     256.5          31.1                5.9 +/-    2.11      10.1 +/-    2.11  0.100 / 0.410
G13     48.3           26.2                4.6 +/-    0.90       8.7 +/-    0.90  0.100 / 0.430
G15     72.7           54.7                4.5 +/-    0.32       5.4 +/-    0.32  0.120 / 0.000
G16     288.8          14.7                1.8 +/-    1.75       4.5 +/-    1.75  0.140 / 0.370
G20     5.8            68.2                5.1 +/-    0.83       5.4 +/-    0.83  0.030 / 0.050
G21     343.1          65.0                3.2 +/-    1.06       3.4 +/-    1.06  0.050 / 0.060
G26     260.6          12.7                4.7 +/-    6.00      12.2 +/-    6.00  0.060 / 0.150
G27     321.9          11.0              -11.7 +/-   22.06     -32.0 +/-   22.06  0.080 / 0.120
G29     166.5          42.5                5.9 +/-    0.97       8.3 +/-    0.97  0.040 / 0.050