PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-17:57:30
G07     21.3           67.4               10.5 +/-    1.06      11.3 +/-    1.06  0.030 / 0.040
G08     68.8           49.6               11.4 +/-    0.75      14.5 +/-    0.75  0.030 / 0.040
G09     181.9          56.1               12.5 +/-    0.42      14.8 +/-    0.42  0.110 / 0.240
G11     132.6          25.4               13.8 +/-    3.10      26.8 +/-    3.10  0.180 / 0.290
G23     159.6          24.2               12.3 +/-    4.08      24.4 +/-    4.08  0.040 / 0.040
G27     43.4           22.1                8.9 +/-    2.21      18.6 +/-    2.21  0.050 / 0.040
G28     250.8          38.3               13.6 +/-    1.93      20.3 +/-    1.93  0.080 / 0.110
G30     317.3          48.6               11.4 +/-    0.98      14.7 +/-    0.98  0.090 / 0.120