PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/15-17:12:30
G07     10.7           67.6               13.4 +/-    0.82      14.3 +/-    0.82  0.040 / 0.060
G08     67.8           50.8               14.6 +/-    0.44      18.2 +/-    0.44  0.040 / 0.060
G09     180.3          51.4               17.1 +/-    1.59      21.2 +/-    1.59  0.040 / 0.060
G11     132.4          26.2               14.0 +/-    0.94      26.5 +/-    0.94  0.050 / 0.060
G23     158.4          16.9               12.1 +/-    1.96      28.8 +/-    1.96  0.080 / 0.160
G27     41.0           18.0               10.1 +/-    0.62      23.4 +/-    0.62  0.070 / 0.170
G28     257.4          44.7               13.2 +/-    0.83      17.9 +/-    0.83  0.050 / 0.120
G30     319.7          50.2               13.3 +/-    0.72      16.8 +/-    0.72  0.050 / 0.090