PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/23-16:42:30
G07     14.0           68.0               11.6 +/-    0.77      12.5 +/-    0.77  0.040 / 0.050
G08     65.6           49.9               13.3 +/-    0.89      16.8 +/-    0.89  0.040 / 0.050
G09     179.9          49.9               14.0 +/-    1.62      17.6 +/-    1.62  0.040 / 0.060
G11     131.2          27.1               14.1 +/-    0.67      26.3 +/-    0.67  0.040 / 0.060
G18     115.2          10.0              -10.8 +/-   13.10     -30.1 +/-   13.10  0.030 / 0.040
G23     158.7          16.1               13.7 +/-    2.28      33.1 +/-    2.28  0.030 / 0.040
G27     40.5           17.1                9.6 +/-    1.36      22.6 +/-    1.36  0.100 / 0.160
G28     258.8          45.5               14.0 +/-    0.90      18.7 +/-    0.90  0.110 / 0.170
G30     320.7          50.9               13.4 +/-    0.88      16.7 +/-    0.88  0.050 / 0.080