PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/13-18:58:00
G01     99.7           29.0               13.1 +/-    1.74      23.4 +/-    1.74  0.320 / 0.350
G07     116.5          53.1               13.9 +/-    0.88      17.0 +/-    0.88  0.230 / 0.270
G08     41.9           16.7                9.7 +/-    2.86      23.1 +/-    2.86  0.040 / 0.030
G11     80.4           42.7               13.2 +/-    1.45      18.4 +/-    1.45  0.030 / 0.030
G13     303.6          32.5               11.7 +/-    0.98      19.5 +/-    0.98  0.030 / 0.040
G17     210.0          41.8               15.6 +/-    0.65      22.0 +/-    0.65  0.030 / 0.050
G18     73.0           24.9               12.4 +/-    0.88      24.3 +/-    0.88  0.070 / 0.130
G19     211.5          18.2               13.7 +/-    1.73      31.6 +/-    1.73  0.090 / 0.120
G28     332.8          61.8               12.5 +/-    0.35      14.0 +/-    0.35  0.060 / 0.050
G30     68.1           79.2               13.8 +/-    0.59      14.0 +/-    0.59  0.050 / 0.060