PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/15-19:12:30
G07     7.5            67.1               11.4 +/-    0.45      12.2 +/-    0.45  0.030 / 0.020
G08     71.8           52.5               12.3 +/-    0.89      15.0 +/-    0.89  0.040 / 0.020
G09     181.2          53.3               14.9 +/-    0.80      18.1 +/-    0.80  0.100 / 0.210
G11     134.2          25.1               16.9 +/-    2.85      32.9 +/-    2.85  0.080 / 0.180
G23     158.3          18.4               14.8 +/-    1.48      33.8 +/-    1.48  0.040 / 0.030
G27     41.5           18.8                9.7 +/-    2.90      22.1 +/-    2.90  0.030 / 0.010
G28     256.1          44.0               13.6 +/-    4.06      18.5 +/-    4.06  0.040 / 0.020
G30     319.6          50.1               11.1 +/-    0.90      14.0 +/-    0.90  0.040 / 0.020