PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-18:28:10
G01     121.6          15.3               14.8 +/-    2.65      36.6 +/-    2.65  0.030 / 0.040
G07     82.7           63.2               13.1 +/-    0.35      14.5 +/-    0.35  0.030 / 0.030
G08     46.3           33.9               11.4 +/-    1.69      18.5 +/-    1.69  0.030 / 0.040
G09     178.1          31.0               12.5 +/-    1.15      21.5 +/-    1.15  0.030 / 0.030
G11     109.6          39.1               13.7 +/-    0.55      20.3 +/-    0.55  0.080 / 0.090
G13     318.8          17.4               12.2 +/-    2.89      28.6 +/-    2.89  0.080 / 0.090
G17     200.2          21.3               13.8 +/-    2.50      29.4 +/-    2.50  0.090 / 0.220
G18     95.5           19.3               14.1 +/-    2.18      31.5 +/-    2.18  0.130 / 0.210
G28     280.4          52.7               13.8 +/-    2.98      16.9 +/-    2.98  0.180 / 0.490
G30     344.0          67.1               12.1 +/-    0.67      13.0 +/-    0.67  0.130 / 0.410