PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-00:27:50
G10     249.2          25.6               13.8 +/-    2.14      26.6 +/-    2.14  0.040 / 0.050
G13     55.0           30.7               10.4 +/-    0.97      18.0 +/-    0.97  0.040 / 0.040
G15     93.9           58.8               11.7 +/-    1.14      13.5 +/-    1.14  0.190 / 0.330
G16     295.9          16.0                9.5 +/-    1.96      23.1 +/-    1.96  0.160 / 0.330
G20     258.7          34.3               15.5 +/-    3.52      24.9 +/-    3.52  0.080 / 0.120
G21     330.6          58.4               10.3 +/-    1.00      11.9 +/-    1.00  0.070 / 0.130
G26     267.8          16.3               12.6 +/-    1.59      30.4 +/-    1.59  0.030 / 0.040
G29     164.8          52.9               11.8 +/-    1.11      14.4 +/-    1.11  0.040 / 0.040