PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-08:27:50
G08     269.7          17.7                7.9 +/-    2.25      18.5 +/-    2.25  0.130 / 0.260
G10     61.5           58.4                5.0 +/-    0.68       5.8 +/-    0.68  0.130 / 0.290
G11     312.1          16.5               -4.9 +/-   12.56     -11.7 +/-   12.56  0.070 / 0.070
G14     261.7          62.1                6.6 +/-    0.71       7.4 +/-    0.71  0.040 / 0.070
G18     312.6          31.2                7.4 +/-    2.32      12.6 +/-    2.32  0.120 / 0.180
G20     102.4          20.1                5.3 +/-    0.63      11.6 +/-    0.63  0.130 / 0.180
G21     154.9          15.4                5.0 +/-    2.15      12.4 +/-    2.15  0.150 / 0.400
G27     231.3          15.6                7.8 +/-    1.42      19.0 +/-    1.42  0.180 / 0.330
G31     176.6          32.5                6.7 +/-    1.91      11.2 +/-    1.91  0.030 / 0.030
G32     346.7          73.5                5.3 +/-    0.59       5.5 +/-    0.59  0.030 / 0.030