PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/21-18:42:50
G03     247.5          70.9                9.0 +/-    0.43       9.5 +/-    0.43  0.040 / 0.050
G09     299.4          12.8                9.0 +/-    3.43      23.6 +/-    3.43  0.050 / 0.050
G14     94.3           19.7                8.4 +/-    1.10      18.6 +/-    1.10  0.110 / 0.270
G16     137.4          54.0               11.5 +/-    0.60      13.8 +/-    0.60  0.100 / 0.240
G22     197.6          60.9               11.4 +/-    0.82      12.8 +/-    0.82  0.040 / 0.050
G23     315.6          45.6               10.2 +/-    0.72      13.7 +/-    0.72  0.040 / 0.050
G31     49.4           23.7                6.9 +/-    1.67      13.8 +/-    1.67  0.160 / 0.230