PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/28-22:27:50
G02     60.7           33.3                9.1 +/-    1.07      14.8 +/-    1.07  0.050 / 0.080
G05     56.3           61.6               10.1 +/-    0.61      11.3 +/-    0.61  0.050 / 0.060
G12     183.6          27.7               14.0 +/-    2.60      25.7 +/-    2.60  0.090 / 0.210
G13     126.9          17.5               14.1 +/-    2.99      32.9 +/-    2.99  0.120 / 0.240
G15     163.8          13.4               15.0 +/-    2.26      38.7 +/-    2.26  0.030 / 0.040
G20     208.6          65.6               14.5 +/-    1.58      15.7 +/-    1.58  0.030 / 0.040
G21     273.7          19.4                9.9 +/-    1.66      22.0 +/-    1.66  0.050 / 0.120
G25     224.5          47.7               13.4 +/-    0.93      17.4 +/-    0.93  0.100 / 0.110
G29     332.0          59.7               11.7 +/-    1.07      13.4 +/-    1.07  0.030 / 0.030