PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-13:13:10
G03     215.8          60.6                8.2 +/-    0.72       9.2 +/-    0.72  0.110 / 0.350
G07     254.3          12.7                5.2 +/-    3.71      13.7 +/-    3.71  0.200 / 0.390
G09     308.7          25.5                7.0 +/-    1.54      13.5 +/-    1.54  0.150 / 0.480
G14     105.8          12.2                7.1 +/-    2.07      18.9 +/-    2.07  0.140 / 0.720
G16     100.5          63.6               10.0 +/-    0.94      11.0 +/-    0.94  0.040 / 0.080
G22     186.2          42.4                8.4 +/-    1.67      11.8 +/-    1.67  0.040 / 0.070
G23     331.9          60.6                7.5 +/-    0.63       8.4 +/-    0.63  0.030 / 0.040
G26     55.4           44.0                6.4 +/-    1.12       8.7 +/-    1.12  0.030 / 0.050
G31     58.1           10.7                6.9 +/-    2.82      18.9 +/-    2.82  0.120 / 0.270