PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/18-18:43:00
G01     96.9           30.0               12.1 +/-    1.21      21.2 +/-    1.21  0.190 / 0.320
G07     119.5          51.0               12.8 +/-    0.66      16.0 +/-    0.66  0.110 / 0.190
G08     42.0           14.3                8.9 +/-    2.98      22.4 +/-    2.98  0.030 / 0.030
G11     76.9           42.2               11.6 +/-    0.70      16.2 +/-    0.70  0.020 / 0.030
G13     301.0          33.7                9.0 +/-    2.41      14.7 +/-    2.41  0.100 / 0.150
G17     211.4          44.6               14.6 +/-    0.88      19.8 +/-    0.88  0.090 / 0.140
G18     70.3           24.8               10.9 +/-    1.64      21.5 +/-    1.64  0.050 / 0.050
G19     212.4          20.4               12.8 +/-    2.06      27.9 +/-    2.06  0.040 / 0.050
G28     337.9          61.9               10.1 +/-    0.37      11.3 +/-    0.37  0.030 / 0.060
G30     81.2           78.6               13.5 +/-    0.64      13.8 +/-    0.64  0.030 / 0.050