PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/19-21:27:40
G02     201.6          29.5               20.5 +/-    1.18      36.3 +/-    1.18  0.070 / 0.110
G06     164.2          63.9               20.0 +/-    0.99      22.0 +/-    0.99  0.060 / 0.110
G12     304.7          11.8               12.0 +/-    4.73      32.0 +/-    4.73  0.120 / 0.310
G17     27.2           55.8               15.1 +/-    0.69      17.9 +/-    0.69  0.180 / 0.320
G19     343.6          68.5               15.9 +/-    0.46      17.0 +/-    0.46  0.040 / 0.110
G24     303.3          35.3               15.5 +/-    1.03      24.4 +/-    1.03  0.040 / 0.130
G28     97.2           34.5               16.8 +/-    0.59      26.8 +/-    0.59  0.070 / 0.120