PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-18:12:30
G07     9.1            67.3                8.9 +/-    0.76       9.6 +/-    0.76  0.040 / 0.040
G08     69.7           51.6                9.8 +/-    0.45      12.1 +/-    0.45  0.050 / 0.040
G09     180.8          52.4               12.8 +/-    0.90      15.7 +/-    0.90  0.090 / 0.160
G11     133.3          25.7               13.3 +/-    3.67      25.5 +/-    3.67  0.120 / 0.190
G23     158.1          17.0               12.6 +/-    1.18      29.9 +/-    1.18  0.030 / 0.030
G27     41.2           18.4                9.1 +/-    2.19      20.8 +/-    2.19  0.030 / 0.030
G28     256.7          44.4               11.7 +/-    4.05      15.8 +/-    4.05  0.030 / 0.050
G30     319.6          50.1                9.1 +/-    0.39      11.4 +/-    0.39  0.040 / 0.050