PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-00:57:40
G10     263.4          36.0               14.9 +/-    1.17      23.3 +/-    1.17  0.210 / 0.200
G13     43.6           20.8               10.2 +/-    2.02      22.1 +/-    2.02  0.300 / 0.260
G15     65.5           53.3               12.6 +/-    1.15      15.3 +/-    1.15  0.060 / 0.040
G16     280.8          13.4               10.0 +/-    1.41      25.9 +/-    1.41  0.050 / 0.040
G20     274.3          44.0               11.5 +/-    0.72      15.8 +/-    0.72  0.080 / 0.300
G21     352.8          69.1               11.9 +/-    0.92      12.6 +/-    0.92  0.140 / 0.310
G24     122.0          12.3               16.2 +/-    2.52      42.9 +/-    2.52  0.210 / 0.380
G27     320.1          16.0                8.6 +/-    1.28      21.0 +/-    1.28  0.190 / 0.300
G29     168.0          35.9               14.8 +/-    0.99      23.1 +/-    0.99  0.110 / 0.190