PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/18-16:28:00
G07     340.4          60.5               11.6 +/-    0.46      13.2 +/-    0.46  0.030 / 0.040
G08     93.4           53.5               12.6 +/-    0.82      15.2 +/-    0.82  0.030 / 0.040
G09     186.0          68.0               13.1 +/-    0.26      14.0 +/-    0.26  0.080 / 0.120
G11     143.1          16.3               13.4 +/-    2.05      32.3 +/-    2.05  0.070 / 0.090
G23     155.7          31.9               13.8 +/-    1.12      23.3 +/-    1.12  0.130 / 0.120
G27     50.2           28.5               10.1 +/-    2.54      18.2 +/-    2.54  0.070 / 0.130
G28     241.9          33.9               14.0 +/-    1.19      22.8 +/-    1.19  0.030 / 0.040
G30     306.8          39.3               10.6 +/-    1.09      15.6 +/-    1.09  0.040 / 0.050