PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/23-19:57:50
G10     249.3          26.0               16.4 +/-    2.16      31.3 +/-    2.16  0.050 / 0.040
G13     54.7           30.4               10.2 +/-    2.25      17.7 +/-    2.25  0.040 / 0.040
G15     98.7           59.9               11.5 +/-    1.45      13.1 +/-    1.45  0.160 / 0.160
G16     296.6          15.7               10.0 +/-    1.12      24.3 +/-    1.12  0.120 / 0.120
G20     267.8          49.8               13.2 +/-    3.39      16.6 +/-    3.39  0.110 / 0.170
G21     332.4          59.3               11.9 +/-    0.46      13.6 +/-    0.46  0.080 / 0.140
G26     269.1          16.1               14.3 +/-    1.67      34.7 +/-    1.67  0.030 / 0.030
G29     164.3          52.1               13.9 +/-    0.88      17.1 +/-    0.88  0.030 / 0.040