PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-15:42:30
G03     203.2          50.1                9.8 +/-    0.61      12.3 +/-    0.61  0.030 / 0.030
G07     262.1          18.8                8.2 +/-    1.96      18.5 +/-    1.96  0.030 / 0.040
G09     313.2          33.0                6.2 +/-    1.44      10.2 +/-    1.44  0.030 / 0.040
G16     76.0           62.7                8.3 +/-    0.76       9.2 +/-    0.76  0.030 / 0.040
G22     182.4          31.3                8.8 +/-    2.51      15.0 +/-    2.51  0.070 / 0.130
G23     345.0          69.3                7.8 +/-    0.52       8.3 +/-    0.52  0.080 / 0.150
G26     48.2           36.4                7.4 +/-    0.71      11.5 +/-    0.71  0.040 / 0.040
G27     128.7          15.3               10.4 +/-    2.12      25.7 +/-    2.12  0.040 / 0.050