PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-16:28:00
G03     188.0          16.1               10.2 +/-    2.32      24.8 +/-    2.32  0.070 / 0.150
G07     294.1          39.3               10.3 +/-    1.38      15.1 +/-    1.38  0.070 / 0.110
G08     142.0          30.3               13.0 +/-    1.23      22.6 +/-    1.23  0.030 / 0.040
G09     319.1          66.6                8.1 +/-    1.32       8.7 +/-    1.32  0.030 / 0.040
G16     41.9           33.5                7.9 +/-    0.99      13.0 +/-    0.99  0.040 / 0.090
G23     129.2          70.2               10.2 +/-    0.93      10.7 +/-    0.93  0.050 / 0.080
G27     93.9           35.3               11.4 +/-    0.68      18.0 +/-    0.68  0.040 / 0.110
G30     277.4          16.2               12.3 +/-    2.64      29.6 +/-    2.64  0.060 / 0.110