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               12.0 +/-    1.00      13.1 +/-    1.00  0.050 / 0.060
G06     44.0           64.5              -19.1 +/-   21.66     -20.9 +/-   21.66  0.040 / 0.040
G12     321.6          47.0               11.2 +/-    0.95      14.7 +/-    0.95  0.070 / 0.120
G17     67.4           23.9               18.3 +/-    9.96      36.6 +/-    9.96  0.050 / 0.100
G19     52.6           41.0              -46.2 +/-   53.06     -66.1 +/-   53.06  0.040 / 0.060
G24     254.9          38.4               12.1 +/-    2.75      18.1 +/-    2.75  0.040 / 0.060
G25     315.6          11.0               -9.9 +/-   31.40     -27.0 +/-   31.40  0.150 / 0.220