PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-14:27:40
G01     226.7          17.2                9.1 +/-    1.42      21.5 +/-    1.42  0.050 / 0.060
G03     282.2          69.7                9.0 +/-    0.50       9.5 +/-    0.50  0.040 / 0.050
G14     84.8           27.5                8.4 +/-    2.63      15.5 +/-    2.63  0.080 / 0.180
G16     145.4          45.5               10.8 +/-    0.61      14.5 +/-    0.61  0.090 / 0.160
G22     202.5          68.6               10.2 +/-    0.57      10.9 +/-    0.57  0.040 / 0.040
G23     309.9          41.0                8.2 +/-    0.84      11.8 +/-    0.84  0.030 / 0.040
G26     94.8           53.7                8.9 +/-    1.91      10.7 +/-    1.91  0.060 / 0.100
G31     45.7           30.6                7.5 +/-    1.17      13.0 +/-    1.17  0.040 / 0.090