PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/17-16:58:00
G07     3.3            66.4               11.8 +/-    0.68      12.8 +/-    0.68  0.040 / 0.040
G08     72.5           52.0               12.1 +/-    0.60      15.0 +/-    0.60  0.040 / 0.050
G09     180.9          54.8               14.0 +/-    0.85      16.7 +/-    0.85  0.030 / 0.030
G11     134.8          24.2               14.9 +/-    2.19      29.7 +/-    2.19  0.020 / 0.020
G23     158.0          20.0               11.9 +/-    1.58      26.2 +/-    1.58  0.050 / 0.070
G27     42.5           20.4               11.1 +/-    1.94      24.2 +/-    1.94  0.050 / 0.070
G28     253.8          42.6               15.1 +/-    1.84      21.1 +/-    1.84  0.080 / 0.140
G30     316.9          47.8               11.3 +/-    0.54      14.7 +/-    0.54  0.050 / 0.130