PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/21-18:42:40
G01     219.9          10.5               14.5 +/-    1.70      40.0 +/-    1.70  0.040 / 0.040
G03     247.5          70.9                9.4 +/-    0.74       9.8 +/-    0.74  0.040 / 0.050
G09     299.4          12.8               10.6 +/-    2.05      27.9 +/-    2.05  0.040 / 0.060
G14     94.3           19.7                9.4 +/-    1.50      20.8 +/-    1.50  0.040 / 0.060
G16     137.4          54.0               13.1 +/-    0.66      15.8 +/-    0.66  0.090 / 0.230
G22     197.6          60.9               12.4 +/-    0.61      13.9 +/-    0.61  0.120 / 0.240
G23     315.6          45.6                9.3 +/-    1.19      12.4 +/-    1.19  0.290 / 0.370
G26     78.6           53.6                9.0 +/-    0.73      10.9 +/-    0.73  0.210 / 0.440
G31     49.4           23.7                7.6 +/-    1.04      15.4 +/-    1.04  0.030 / 0.040