PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-05:13:00
G10     265.9          37.4                9.0 +/-    0.80      13.7 +/-    0.80  0.050 / 0.060
G13     42.5           19.3                4.5 +/-    1.27      10.0 +/-    1.27  0.050 / 0.040
G15     60.4           49.6                6.3 +/-    0.93       8.0 +/-    0.93  0.120 / 0.400
G16     279.2          12.4                7.1 +/-    1.36      18.9 +/-    1.36  0.130 / 0.450
G20     338.0          68.6                6.8 +/-    0.61       7.3 +/-    0.61  0.130 / 0.170
G21     359.0          71.0                6.9 +/-    0.75       7.3 +/-    0.75  0.130 / 0.160
G24     120.9          13.6                5.7 +/-    2.28      14.5 +/-    2.28  0.120 / 0.310
G27     318.9          18.3                5.0 +/-    1.01      11.4 +/-    1.01  0.220 / 0.350
G29     168.2          32.8                8.5 +/-    1.06      14.1 +/-    1.06  0.080 / 0.060