PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/23-11:58:00
G07     341.2          60.8                4.4 +/-    0.58       5.0 +/-    0.58  0.080 / 0.090
G08     88.4           52.3                5.1 +/-    0.98       6.3 +/-    0.98  0.080 / 0.080
G09     182.0          66.2                7.4 +/-    0.35       8.0 +/-    0.35  0.040 / 0.030
G11     141.7          16.9                4.2 +/-    2.00       9.9 +/-    2.00  0.030 / 0.030
G23     157.0          35.4                6.1 +/-    0.58       9.6 +/-    0.58  0.090 / 0.120
G27     50.5           28.9                4.5 +/-    1.69       8.1 +/-    1.69  0.110 / 0.190
G28     241.6          33.5                4.9 +/-    1.80       8.0 +/-    1.80  0.050 / 0.080
G30     305.6          37.8                4.2 +/-    1.42       6.3 +/-    1.42  0.060 / 0.080