PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/06/20-16:12:50
G01     71.6           32.6                9.3 +/-    1.77      15.5 +/-    1.77  0.040 / 0.040
G07     136.2          27.7               12.5 +/-    0.78      23.0 +/-    0.78  0.040 / 0.060
G11     54.0           31.8                8.2 +/-    1.70      13.8 +/-    1.70  0.070 / 0.110
G13     275.2          38.6               10.4 +/-    0.81      15.5 +/-    0.81  0.070 / 0.120
G15     303.2          15.2               10.3 +/-    1.53      25.5 +/-    1.53  0.080 / 0.120
G17     229.0          66.1               12.7 +/-    0.94      13.7 +/-    0.94  0.100 / 0.120
G18     49.0           18.2                8.8 +/-    2.22      20.3 +/-    2.22  0.050 / 0.110
G19     222.3          41.8               12.9 +/-    1.74      18.2 +/-    1.74  0.070 / 0.110
G28     5.7            61.1               11.4 +/-    0.69      12.8 +/-    0.69  0.050 / 0.010
G30     134.2          60.3               11.4 +/-    0.71      12.9 +/-    0.71  0.040 / 0.020