PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-16:42:40
G07     4.8            66.6               10.2 +/-    0.75      11.0 +/-    0.75  0.030 / 0.040
G08     71.3           51.6               11.0 +/-    0.67      13.5 +/-    0.67  0.040 / 0.040
G09     180.6          54.0               11.9 +/-    0.64      14.4 +/-    0.64  0.040 / 0.050
G11     134.2          24.6               12.9 +/-    3.19      25.5 +/-    3.19  0.050 / 0.050
G23     158.2          19.6                9.9 +/-    1.84      22.1 +/-    1.84  0.020 / 0.040
G27     42.2           19.9                9.9 +/-    2.06      21.9 +/-    2.06  0.030 / 0.040
G28     254.5          43.0               13.3 +/-    2.29      18.5 +/-    2.29  0.090 / 0.070
G30     317.3          48.2               10.8 +/-    0.72      13.9 +/-    0.72  0.150 / 0.160