PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-19:27:40
G02     226.1          65.4               15.8 +/-    4.23      17.2 +/-    4.23  0.170 / 0.500
G06     44.0           64.5              -18.5 +/-   25.23     -20.2 +/-   25.23  0.150 / 0.430
G12     321.6          47.0               24.7 +/-   15.23      32.4 +/-   15.23  0.070 / 0.160
G17     67.4           23.9                7.1 +/-    4.68      14.2 +/-    4.68  0.060 / 0.130
G19     52.6           41.0              -40.2 +/-   59.90     -57.5 +/-   59.90  0.050 / 0.060
G24     254.9          38.4               11.3 +/-    0.42      16.9 +/-    0.42  0.050 / 0.050
G25     315.6          11.0               -7.5 +/-   39.69     -20.6 +/-   39.69  0.060 / 0.100