PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/18-17:27:50
G01     253.6          36.3               10.2 +/-    2.09      15.7 +/-    2.09  0.040 / 0.040
G03     316.2          45.0                8.6 +/-    0.67      11.6 +/-    0.67  0.050 / 0.040
G11     241.6          13.9                8.1 +/-    2.09      20.6 +/-    2.09  0.110 / 0.200
G14     57.0           43.3                8.9 +/-    1.32      12.3 +/-    1.32  0.250 / 0.270
G22     306.3          65.9                9.1 +/-    0.59       9.9 +/-    0.59  0.030 / 0.030
G23     285.7          19.3                8.7 +/-    2.09      19.5 +/-    2.09  0.030 / 0.030
G25     41.7           11.7                8.4 +/-    1.13      22.6 +/-    1.13  0.040 / 0.070
G26     137.4          36.6               11.1 +/-    0.61      17.1 +/-    0.61  0.050 / 0.080
G31     41.5           59.8                8.1 +/-    0.58       9.2 +/-    0.58  0.050 / 0.060
G32     76.1           23.5                8.8 +/-    1.18      17.8 +/-    1.18  0.050 / 0.050