PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/13-16:42:50
G07     305.4          47.9               10.9 +/-    2.11      14.2 +/-    2.11  0.100 / 0.100
G08     132.7          36.1               12.1 +/-    0.80      18.9 +/-    0.80  0.080 / 0.090
G09     315.6          71.5               10.8 +/-    1.07      11.3 +/-    1.07  0.060 / 0.060
G16     42.0           33.4                7.8 +/-    1.21      12.8 +/-    1.21  0.080 / 0.060
G23     137.3          70.5               11.6 +/-    0.52      12.3 +/-    0.52  0.090 / 0.160
G27     89.8           36.9               12.4 +/-    0.67      19.1 +/-    0.67  0.080 / 0.180
G30     281.7          19.6               11.0 +/-    1.13      24.3 +/-    1.13  0.040 / 0.030