PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-21:57:50
G10     272.7          40.7               17.2 +/-    1.35      24.7 +/-    1.35  0.110 / 0.280
G13     40.3           15.7               11.7 +/-    2.42      28.6 +/-    2.42  0.120 / 0.290
G15     54.4           44.8               13.6 +/-    0.69      18.4 +/-    0.69  0.030 / 0.050
G18     313.2          65.9               14.5 +/-    0.95      15.7 +/-    0.95  0.040 / 0.040
G20     58.4           30.5               14.3 +/-    0.99      24.7 +/-    0.99  0.110 / 0.250
G21     24.2           75.2               16.6 +/-    0.57      17.2 +/-    0.57  0.100 / 0.260
G24     117.0          17.0               17.2 +/-    1.78      40.7 +/-    1.78  0.110 / 0.550
G27     314.9          24.3               12.7 +/-    1.78      25.2 +/-    1.78  0.110 / 0.480
G29     166.7          21.7               16.6 +/-    1.67      35.1 +/-    1.67  0.060 / 0.130
G32     206.1          11.7                2.1 +/-   48.88       5.8 +/-   48.88  0.060 / 0.160