PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/20-21:58:10
G01     117.5          19.2               11.9 +/-    1.70      26.8 +/-    1.70  0.110 / 0.190
G07     84.4           65.9               11.8 +/-    0.65      12.7 +/-    0.65  0.130 / 0.190
G08     45.3           33.4                8.7 +/-    0.89      14.2 +/-    0.89  0.300 / 0.230
G09     177.4          25.0               12.5 +/-    2.52      24.5 +/-    2.52  0.190 / 0.230
G11     107.8          40.7               11.1 +/-    0.34      15.9 +/-    0.34  0.050 / 0.060
G13     317.1          20.3                7.3 +/-    2.18      15.9 +/-    2.18  0.030 / 0.060
G17     203.2          23.6               11.7 +/-    2.13      23.6 +/-    2.13  0.040 / 0.060
G28     297.2          58.4               10.0 +/-    0.89      11.5 +/-    0.89  0.040 / 0.040
G30     358.6          72.0               10.8 +/-    0.29      11.3 +/-    0.29  0.030 / 0.030