PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-18:58:00
G07     4.6            66.6               11.2 +/-    0.67      12.1 +/-    0.67  0.030 / 0.050
G08     73.6           52.8               12.7 +/-    0.71      15.4 +/-    0.71  0.030 / 0.040
G09     181.4          54.7               14.4 +/-    0.90      17.2 +/-    0.90  0.120 / 0.260
G11     135.0          24.3               16.7 +/-    2.21      33.1 +/-    2.21  0.140 / 0.210
G23     158.1          19.4               13.9 +/-    2.91      31.0 +/-    2.91  0.050 / 0.050
G27     42.1           19.7               10.3 +/-    2.04      22.9 +/-    2.04  0.040 / 0.050
G28     254.6          43.2               14.1 +/-    3.08      19.5 +/-    3.08  0.030 / 0.040
G30     318.3          49.1               11.1 +/-    0.55      14.2 +/-    0.55  0.030 / 0.030