PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/27-18:57:40
G03     208.9          57.6               10.9 +/-    0.57      12.7 +/-    0.57  0.050 / 0.060
G07     255.8          14.0               11.6 +/-    2.64      29.6 +/-    2.64  0.050 / 0.080
G09     309.3          26.0                8.1 +/-    1.52      15.4 +/-    1.52  0.180 / 0.280
G16     100.2          64.7               11.2 +/-    0.96      12.3 +/-    0.96  0.190 / 0.320
G22     187.3          42.0               11.7 +/-    0.86      16.5 +/-    0.86  0.030 / 0.040
G23     331.0          60.2                9.1 +/-    0.41      10.3 +/-    0.41  0.030 / 0.030
G26     54.4           43.8                9.6 +/-    1.00      13.2 +/-    1.00  0.120 / 0.360
G27     134.4          10.0               -8.7 +/-   32.80     -24.2 +/-   32.80  0.140 / 0.350
G31     58.8           10.5                7.8 +/-    1.24      21.6 +/-    1.24  0.040 / 0.030