PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-20:27:50
G01     86.6           32.6               13.4 +/-    1.08      22.2 +/-    1.08  0.020 / 0.030
G07     128.2          43.3               17.6 +/-    0.60      24.3 +/-    0.60  0.030 / 0.030
G11     66.6           39.4               14.2 +/-    1.02      20.9 +/-    1.02  0.240 / 0.200
G13     291.3          36.6               13.8 +/-    2.30      21.3 +/-    2.30  0.220 / 0.250
G15     313.2          11.3                4.4 +/-   22.81      12.0 +/-   22.81  0.040 / 0.050
G17     217.6          52.2               19.2 +/-    1.75      23.6 +/-    1.75  0.050 / 0.060
G18     61.2           23.4               12.1 +/-    1.53      24.5 +/-    1.53  0.080 / 0.220
G19     216.2          28.9               20.1 +/-    1.36      35.9 +/-    1.36  0.080 / 0.190
G28     355.9          61.5               14.0 +/-    0.88      15.7 +/-    0.88  0.030 / 0.050
G30     114.9          72.2               16.5 +/-    0.73      17.3 +/-    0.73  0.030 / 0.060