PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/19-19:58:00
G01     54.8           28.4               12.3 +/-    0.74      22.3 +/-    0.74  0.110 / 0.270
G06     178.3          20.6              -11.5 +/-   45.57     -24.9 +/-   45.57  0.080 / 0.180
G07     144.5          17.8               18.1 +/-    1.68      42.0 +/-    1.68  0.080 / 0.350
G11     46.5           20.2               11.4 +/-    1.19      25.0 +/-    1.19  0.110 / 0.390
G13     256.5          33.1               16.2 +/-    1.08      26.7 +/-    1.08  0.030 / 0.060
G15     289.4          16.1               11.4 +/-    2.59      27.6 +/-    2.59  0.040 / 0.050
G17     273.0          76.5               15.6 +/-    0.60      16.0 +/-    0.60  0.110 / 0.290
G19     238.4          53.8               17.1 +/-    0.90      20.7 +/-    0.90  0.110 / 0.260
G28     44.6           54.8               14.6 +/-    0.83      17.4 +/-    0.83  0.040 / 0.060
G30     146.8          46.1               17.6 +/-    0.63      23.3 +/-    0.63  0.060 / 0.060