PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/12-17:27:50
G03     188.3          17.8               14.8 +/-    3.15      34.5 +/-    3.15  0.100 / 0.130
G07     291.6          37.9               12.6 +/-    2.19      19.0 +/-    2.19  0.100 / 0.110
G08     144.7          27.8               14.2 +/-    2.26      26.1 +/-    2.26  0.030 / 0.040
G09     319.9          63.8               11.6 +/-    1.58      12.8 +/-    1.58  0.030 / 0.040
G16     42.3           36.2               10.1 +/-    1.28      15.7 +/-    1.28  0.040 / 0.120
G23     123.9          73.6               11.9 +/-    0.60      12.3 +/-    0.60  0.040 / 0.140
G27     96.8           34.4               12.0 +/-    1.00      19.2 +/-    1.00  0.060 / 0.090
G30     275.7          15.2               11.5 +/-    1.44      28.4 +/-    1.44  0.070 / 0.090