PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/07-18:27:50
G07     3.4            65.5               10.9 +/-    0.46      11.9 +/-    0.46  0.040 / 0.040
G08     79.4           51.5               11.4 +/-    0.71      14.2 +/-    0.71  0.050 / 0.040
G09     184.3          63.6               13.0 +/-    0.53      14.4 +/-    0.53  0.110 / 0.140
G11     137.6          20.8               14.3 +/-    1.28      30.9 +/-    1.28  0.080 / 0.190
G23     158.5          31.6               12.8 +/-    1.36      21.7 +/-    1.36  0.090 / 0.160
G27     47.9           27.0                8.5 +/-    2.58      15.8 +/-    2.58  0.070 / 0.140
G28     244.3          33.5               11.4 +/-    1.48      18.6 +/-    1.48  0.040 / 0.040
G30     311.0          43.2               10.9 +/-    1.27      15.1 +/-    1.27  0.030 / 0.030