PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-15:28:00
G03     209.2          56.9                8.9 +/-    0.72      10.4 +/-    0.72  0.040 / 0.030
G07     256.7          14.6                7.3 +/-    1.05      18.3 +/-    1.05  0.040 / 0.030
G09     310.1          27.4                6.0 +/-    1.90      11.1 +/-    1.90  0.030 / 0.040
G16     93.2           64.1                8.1 +/-    1.04       8.9 +/-    1.04  0.030 / 0.040
G22     184.2          38.2                8.3 +/-    1.17      12.4 +/-    1.17  0.090 / 0.340
G23     335.9          63.5                8.0 +/-    0.53       8.9 +/-    0.53  0.080 / 0.210
G26     52.7           41.9                7.2 +/-    0.98      10.1 +/-    0.98  0.040 / 0.040
G27     133.8          10.7                4.0 +/-   31.59      10.9 +/-   31.59  0.060 / 0.040