PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/15-19:28:00
G02     255.0          77.8               11.7 +/-    0.36      12.0 +/-    0.36  0.140 / 0.190
G05     169.9          20.3               15.9 +/-    1.29      34.7 +/-    1.29  0.110 / 0.190
G06     40.3           52.0               12.4 +/-    0.61      15.3 +/-    0.61  0.090 / 0.150
G12     322.0          60.1               10.7 +/-    1.05      12.1 +/-    1.05  0.070 / 0.160
G17     74.7           19.7               11.7 +/-    2.23      25.9 +/-    2.23  0.270 / 0.240
G19     59.6           38.1               11.6 +/-    0.70      17.5 +/-    0.70  0.230 / 0.330
G24     239.1          31.9               13.8 +/-    1.18      23.2 +/-    1.18  0.040 / 0.040
G25     317.3          16.5               11.5 +/-    1.86      27.5 +/-    1.86  0.040 / 0.040