PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/21-20:57:50
G07     10.7           67.5               12.1 +/-    1.00      13.0 +/-    1.00  0.210 / 0.270
G08     69.5           51.8               11.5 +/-    0.89      14.2 +/-    0.89  0.340 / 0.170
G09     181.2          52.2               15.0 +/-    0.78      18.4 +/-    0.78  0.040 / 0.040
G11     133.9          25.7               13.9 +/-    2.33      26.7 +/-    2.33  0.050 / 0.040
G23     158.9          18.4               13.7 +/-    1.14      31.4 +/-    1.14  0.100 / 0.180
G27     40.9           17.7                9.1 +/-    2.94      21.1 +/-    2.94  0.070 / 0.100
G28     257.7          45.0               13.0 +/-    3.12      17.5 +/-    3.12  0.120 / 0.170
G30     321.7          51.9               10.5 +/-    0.80      12.9 +/-    0.80  0.110 / 0.160