PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-19:12:30
G02     215.8          54.8               14.3 +/-    0.96      17.1 +/-    0.96  0.050 / 0.080
G06     59.4           74.5               13.5 +/-    0.44      14.0 +/-    0.44  0.080 / 0.090
G12     319.1          37.1                9.2 +/-    1.95      14.0 +/-    1.95  0.060 / 0.080
G17     58.8           30.4               10.7 +/-    0.32      18.6 +/-    0.32  0.060 / 0.120
G19     41.5           47.8               12.2 +/-    1.18      15.8 +/-    1.18  0.040 / 0.080
G24     268.7          41.6               11.6 +/-    1.38      16.5 +/-    1.38  0.030 / 0.080
G28     122.6          13.8               11.8 +/-    2.09      30.1 +/-    2.09  0.050 / 0.070