PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-18:28:10
G07     18.2           68.5               12.0 +/-    0.65      12.8 +/-    0.65  0.060 / 0.050
G08     64.6           50.0               13.5 +/-    1.23      17.0 +/-    1.23  0.050 / 0.040
G09     180.1          48.5               14.3 +/-    1.06      18.4 +/-    1.06  0.170 / 0.290
G11     130.4          28.0               15.7 +/-    2.15      28.6 +/-    2.15  0.140 / 0.220
G18     113.9          10.9               14.1 +/-    3.52      38.6 +/-    3.52  0.030 / 0.030
G23     158.5          13.7               14.3 +/-    2.86      36.7 +/-    2.86  0.030 / 0.030
G27     39.8           15.6               10.6 +/-    1.90      26.1 +/-    1.90  0.270 / 0.370
G28     261.1          46.7               13.9 +/-    3.67      18.2 +/-    3.67  0.220 / 0.420
G30     323.1          52.9               11.8 +/-    0.65      14.4 +/-    0.65  0.050 / 0.040