PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/18-17:27:30
G02     203.0          29.9               13.1 +/-    1.17      23.0 +/-    1.17  0.100 / 0.060
G06     159.3          67.1               12.4 +/-    0.54      13.4 +/-    0.54  0.120 / 0.100
G12     306.9          15.9               10.4 +/-    2.14      25.2 +/-    2.14  0.050 / 0.030
G17     33.1           51.5               11.4 +/-    1.39      14.1 +/-    1.39  0.030 / 0.030
G19     346.0          67.8               11.0 +/-    0.80      11.8 +/-    0.80  0.180 / 0.290
G24     300.1          37.4               11.5 +/-    1.28      17.4 +/-    1.28  0.290 / 0.220
G28     99.4           33.2               11.4 +/-    0.93      18.8 +/-    0.93  0.040 / 0.030