PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/18-12:27:40
G01     227.1          17.7                7.6 +/-    4.33      17.7 +/-    4.33  0.030 / 0.080
G03     286.6          68.4                4.5 +/-    0.69       4.8 +/-    0.69  0.030 / 0.070
G16     145.2          45.2               10.2 +/-    0.93      13.7 +/-    0.93  0.130 / 0.330
G22     205.9          69.6                8.3 +/-    0.67       8.8 +/-    0.67  0.150 / 0.270
G23     309.4          40.5                4.5 +/-    0.73       6.5 +/-    0.73  0.040 / 0.040
G26     95.4           53.5                8.4 +/-    0.55      10.2 +/-    0.55  0.040 / 0.050
G31     45.6           30.8                5.0 +/-    0.67       8.6 +/-    0.67  0.070 / 0.090