PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-15:57:40
G07     328.1          56.1               11.2 +/-    0.42      13.2 +/-    0.42  0.040 / 0.030
G08     107.4          51.3               12.2 +/-    0.39      15.1 +/-    0.39  0.030 / 0.050
G09     196.8          76.6               11.5 +/-    0.39      11.8 +/-    0.39  0.090 / 0.090
G11     148.3          11.2               10.6 +/-    7.01      28.9 +/-    7.01  0.100 / 0.140
G23     153.1          40.5               11.2 +/-    0.61      16.2 +/-    0.61  0.040 / 0.040
G27     57.7           32.9               10.0 +/-    1.42      16.6 +/-    1.42  0.040 / 0.040
G28     235.2          27.4               12.9 +/-    1.93      23.9 +/-    1.93  0.180 / 0.150
G30     300.1          33.7                9.6 +/-    1.78      15.6 +/-    1.78  0.090 / 0.160