PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-14:58:10
G03     187.9          14.7               11.0 +/-    3.99      27.6 +/-    3.99  0.040 / 0.080
G07     296.5          40.7               11.1 +/-    1.03      15.9 +/-    1.03  0.040 / 0.080
G08     139.0          32.7               12.2 +/-    0.84      20.3 +/-    0.84  0.080 / 0.120
G09     318.0          69.6                9.7 +/-    0.93      10.2 +/-    0.93  0.070 / 0.140
G16     41.7           31.0                8.2 +/-    0.57      14.1 +/-    0.57  0.120 / 0.320
G23     132.9          68.8               12.3 +/-    0.97      13.1 +/-    0.97  0.190 / 0.360
G27     91.1           36.0               10.7 +/-    0.32      16.6 +/-    0.32  0.050 / 0.120
G30     278.9          17.0               12.4 +/-    1.76      29.5 +/-    1.76  0.060 / 0.130