PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-19:28:00
G01     122.0          15.8               14.1 +/-    2.10      34.4 +/-    2.10  0.100 / 0.190
G07     70.3           68.3               14.2 +/-    0.34      15.2 +/-    0.34  0.130 / 0.230
G08     48.0           37.8               11.1 +/-    1.27      16.8 +/-    1.27  0.070 / 0.070
G09     177.9          30.0               16.0 +/-    2.76      28.0 +/-    2.76  0.050 / 0.060
G11     113.1          38.3               15.4 +/-    0.98      23.1 +/-    0.98  0.130 / 0.370
G13     319.3          16.4               11.9 +/-    2.97      28.7 +/-    2.97  0.130 / 0.360
G17     202.3          17.2               17.5 +/-    2.17      41.3 +/-    2.17  0.030 / 0.040
G18     98.3           19.5               12.9 +/-    1.46      28.7 +/-    1.46  0.030 / 0.030
G28     287.2          56.2               14.0 +/-    2.12      16.5 +/-    2.12  0.030 / 0.040
G30     344.5          67.0               13.8 +/-    0.45      14.8 +/-    0.45  0.030 / 0.040