PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/21-21:43:00
G07     316.9          51.1               10.6 +/-    1.28      13.2 +/-    1.28  0.070 / 0.180
G08     120.7          46.6               13.7 +/-    1.61      18.0 +/-    1.61  0.070 / 0.200
G09     252.7          82.6               10.8 +/-    1.20      10.8 +/-    1.20  0.130 / 0.270
G16     43.5           17.1                7.6 +/-    1.03      18.0 +/-    1.03  0.150 / 0.380
G23     149.9          52.4               12.0 +/-    0.99      14.7 +/-    0.99  0.050 / 0.080
G27     66.9           35.7                9.1 +/-    0.64      14.2 +/-    0.64  0.050 / 0.080
G28     229.3          20.7               12.8 +/-    2.03      27.6 +/-    2.03  0.030 / 0.060
G30     294.8          31.0               11.0 +/-    1.04      18.8 +/-    1.04  0.030 / 0.060