PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-01:58:00
G10     264.1          35.6               13.3 +/-    1.16      20.9 +/-    1.16  0.200 / 0.420
G13     43.8           21.6               11.0 +/-    2.24      23.3 +/-    2.24  0.250 / 0.410
G15     65.0           53.2               13.0 +/-    0.61      15.8 +/-    0.61  0.050 / 0.040
G16     282.8          12.3               10.8 +/-    5.02      28.7 +/-    5.02  0.050 / 0.030
G18     292.3          62.3               11.8 +/-    0.88      13.2 +/-    0.88  0.160 / 0.330
G20     53.5           35.2               12.3 +/-    1.96      19.5 +/-    1.96  0.160 / 0.270
G21     355.8          70.2               12.1 +/-    0.58      12.8 +/-    0.58  0.100 / 0.090
G24     123.5          12.3               12.7 +/-    2.26      33.6 +/-    2.26  0.100 / 0.070
G27     318.9          18.3               11.1 +/-    1.83      25.5 +/-    1.83  0.090 / 0.110
G29     167.2          32.2               14.1 +/-    0.96      23.6 +/-    0.96  0.110 / 0.120