PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-16:57:30
G02     212.9          52.9               11.5 +/-    0.96      14.1 +/-    0.96  0.060 / 0.050
G06     74.0           77.9               11.4 +/-    0.26      11.6 +/-    0.26  0.050 / 0.050
G12     317.4          32.6                8.3 +/-    1.75      13.8 +/-    1.75  0.060 / 0.100
G17     55.8           32.8                8.9 +/-    1.18      14.7 +/-    1.18  0.090 / 0.100
G19     37.0           50.4               10.7 +/-    1.72      13.5 +/-    1.72  0.060 / 0.070
G24     273.9          42.0               10.1 +/-    2.06      14.2 +/-    2.06  0.040 / 0.090
G28     120.1          16.4                9.0 +/-    2.12      21.7 +/-    2.12  0.050 / 0.040