PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/13-17:43:10
G07     40.0           69.8               13.3 +/-    0.73      14.1 +/-    0.73  0.040 / 0.060
G08     55.1           44.6               11.9 +/-    0.68      16.1 +/-    0.68  0.040 / 0.060
G09     178.8          40.2               15.2 +/-    1.72      22.0 +/-    1.72  0.030 / 0.030
G11     123.3          32.9               14.4 +/-    1.08      23.8 +/-    1.08  0.030 / 0.040
G18     107.5          14.8               15.1 +/-    2.02      37.8 +/-    2.02  0.030 / 0.030
G27     37.6           9.8                 9.0 +/-    4.55      25.3 +/-    4.55  0.030 / 0.030
G28     271.1          51.1               14.3 +/-    3.46      17.8 +/-    3.46  0.190 / 0.320
G30     330.2          58.3               12.7 +/-    0.71      14.7 +/-    0.71  0.170 / 0.270