PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/28-15:13:00
G01     83.6           32.6                8.3 +/-    1.41      13.8 +/-    1.41  0.060 / 0.100
G07     130.1          37.3               11.6 +/-    1.10      17.7 +/-    1.10  0.070 / 0.120
G11     61.3           34.5               10.1 +/-    1.08      16.1 +/-    1.08  0.030 / 0.020
G13     290.4          36.2               12.9 +/-    1.95      20.0 +/-    1.95  0.030 / 0.020
G17     218.9          61.5               11.7 +/-    1.23      13.1 +/-    1.23  0.040 / 0.050
G19     217.1          33.8               14.0 +/-    1.64      22.7 +/-    1.64  0.040 / 0.050
G28     359.5          61.1                9.0 +/-    0.93      10.2 +/-    0.93  0.050 / 0.090
G30     114.4          74.3                9.0 +/-    0.52       9.4 +/-    0.52  0.090 / 0.080