PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/26-16:57:40
G07     304.5          45.0               11.3 +/-    1.81      15.2 +/-    1.81  0.080 / 0.140
G08     134.0          38.5               12.8 +/-    0.87      19.1 +/-    0.87  0.190 / 0.190
G09     308.2          76.6               12.1 +/-    0.95      12.4 +/-    0.95  0.060 / 0.080
G16     41.9           24.5                9.4 +/-    1.82      18.6 +/-    1.82  0.070 / 0.090
G23     141.5          60.2               12.9 +/-    0.22      14.6 +/-    0.22  0.030 / 0.040
G27     80.9           37.1               10.0 +/-    0.79      15.3 +/-    0.79  0.030 / 0.040
G28     223.3          11.5                0.8 +/-   23.11       2.1 +/-   23.11  0.100 / 0.080
G30     285.1          22.2               11.7 +/-    1.16      24.5 +/-    1.16  0.090 / 0.100