PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-07:27:50
G10     287.7          48.1                6.0 +/-    2.84       7.7 +/-    2.84  0.060 / 0.090
G15     47.6           33.7                5.3 +/-    1.14       8.6 +/-    1.14  0.070 / 0.090
G20     42.6           53.3                6.6 +/-    1.03       8.0 +/-    1.03  0.090 / 0.140
G21     69.4           77.0                6.3 +/-    0.24       6.4 +/-    0.24  0.090 / 0.120
G24     104.6          23.6                7.5 +/-    1.16      15.0 +/-    1.16  0.040 / 0.040
G27     306.7          31.2                6.8 +/-    1.33      11.6 +/-    1.33  0.050 / 0.060
G29     168.7          14.0                5.3 +/-    2.15      13.5 +/-    2.15  0.040 / 0.040
G32     207.8          26.9                7.0 +/-    1.37      13.2 +/-    1.37  0.040 / 0.040