PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-17:28:00
G07     357.8          64.6               11.3 +/-    0.46      12.3 +/-    0.46  0.040 / 0.040
G08     85.3           52.1               11.6 +/-    0.70      14.3 +/-    0.70  0.040 / 0.040
G09     186.5          67.2               11.6 +/-    0.51      12.5 +/-    0.51  0.090 / 0.160
G11     139.9          18.7               11.6 +/-    1.31      26.4 +/-    1.31  0.170 / 0.180
G23     157.6          34.4               11.4 +/-    1.20      18.3 +/-    1.20  0.080 / 0.060
G27     50.2           28.9                9.7 +/-    2.41      17.3 +/-    2.41  0.080 / 0.060
G28     241.5          30.9               12.7 +/-    1.28      21.9 +/-    1.28  0.090 / 0.090
G30     308.7          41.4               10.3 +/-    1.54      14.6 +/-    1.54  0.070 / 0.150