PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-13:27:50
G01     250.8          35.1                8.5 +/-    1.00      13.4 +/-    1.00  0.050 / 0.080
G03     315.7          47.0                5.1 +/-    1.57       6.7 +/-    1.57  0.040 / 0.080
G11     238.6          12.3                6.9 +/-    3.61      18.4 +/-    3.61  0.110 / 0.340
G14     57.9           43.5                6.5 +/-    0.74       9.0 +/-    0.74  0.150 / 0.350
G18     221.4          27.5                8.3 +/-    1.73      15.3 +/-    1.73  0.040 / 0.070
G22     299.6          71.8                7.4 +/-    0.63       7.7 +/-    0.63  0.040 / 0.060
G25     40.1           10.4                5.6 +/-    1.73      15.6 +/-    1.73  0.050 / 0.100
G26     133.7          39.0                9.5 +/-    0.76      14.0 +/-    0.76  0.050 / 0.100
G31     41.2           55.9                7.6 +/-    0.74       9.0 +/-    0.74  0.130 / 0.510
G32     78.5           21.3                6.4 +/-    1.06      13.6 +/-    1.06  0.090 / 0.670