PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/23-18:12:30
G02     218.1          60.1               10.8 +/-    1.18      12.3 +/-    1.18  0.100 / 0.080
G06     52.3           70.8               11.2 +/-    0.52      11.8 +/-    0.52  0.100 / 0.110
G12     320.2          41.3                9.7 +/-    0.64      13.8 +/-    0.64  0.040 / 0.060
G17     59.1           31.0               10.6 +/-    1.43      18.2 +/-    1.43  0.050 / 0.060
G19     38.1           50.3                9.2 +/-    2.05      11.6 +/-    2.05  0.030 / 0.020
G24     261.1          41.3               11.6 +/-    3.64      16.5 +/-    3.64  0.030 / 0.030
G28     123.8          12.4               10.9 +/-    3.98      28.8 +/-    3.98  0.040 / 0.040