PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-17:27:30
G07     350.0          63.0               11.2 +/-    0.72      12.5 +/-    0.72  0.030 / 0.040
G08     91.9           52.0               11.7 +/-    0.90      14.4 +/-    0.90  0.040 / 0.040
G09     190.0          71.2               13.6 +/-    0.66      14.3 +/-    0.66  0.080 / 0.090
G11     142.4          16.3               11.7 +/-    2.46      28.1 +/-    2.46  0.090 / 0.100
G23     156.6          38.3               12.5 +/-    0.84      18.7 +/-    0.84  0.030 / 0.030
G27     53.4           31.1               10.4 +/-    1.27      17.9 +/-    1.27  0.030 / 0.030
G28     238.4          28.0               12.7 +/-    2.06      23.2 +/-    2.06  0.150 / 0.130
G30     305.5          38.8               11.1 +/-    1.73      16.4 +/-    1.73  0.080 / 0.150