PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/19-13:42:50
G01     83.7           32.7                4.5 +/-    1.06       7.4 +/-    1.06  0.190 / 0.250
G07     130.0          37.9                7.5 +/-    0.91      11.3 +/-    0.91  0.150 / 0.160
G11     61.6           34.9                5.4 +/-    1.04       8.6 +/-    1.04  0.030 / 0.020
G13     290.6          36.1                8.7 +/-    1.11      13.5 +/-    1.11  0.030 / 0.020
G15     313.6          10.8               -3.5 +/-   16.34      -9.5 +/-   16.34  0.040 / 0.060
G17     218.8          61.5                7.0 +/-    1.16       7.8 +/-    1.16  0.040 / 0.060
G19     217.1          33.8                9.7 +/-    1.44      15.8 +/-    1.44  0.070 / 0.090
G28     359.7          61.1                5.2 +/-    1.03       5.8 +/-    1.03  0.050 / 0.090
G30     114.9          74.0                5.7 +/-    0.50       5.9 +/-    0.50  0.060 / 0.100