PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/19-21:12:30
G03     186.3          12.9               16.3 +/-    2.60      42.7 +/-    2.60  0.050 / 0.130
G07     297.4          41.2               10.6 +/-    0.88      15.1 +/-    0.88  0.050 / 0.150
G08     138.4          33.3               15.0 +/-    1.18      24.5 +/-    1.18  0.060 / 0.120
G09     317.3          69.1               10.4 +/-    1.00      11.1 +/-    1.00  0.070 / 0.100
G16     41.7           32.7                8.8 +/-    0.91      14.5 +/-    0.91  0.060 / 0.070
G23     133.7          70.9               12.2 +/-    0.64      12.9 +/-    0.64  0.060 / 0.080
G27     89.3           36.0               11.7 +/-    1.38      18.2 +/-    1.38  0.030 / 0.040
G30     280.9          20.4               10.4 +/-    1.98      22.6 +/-    1.98  0.030 / 0.050