PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/21-21:28:00
G07     355.5          64.3               14.1 +/-    0.81      15.5 +/-    0.81  0.040 / 0.040
G08     81.2           51.3               13.4 +/-    0.92      16.7 +/-    0.92  0.030 / 0.040
G09     183.8          65.0               15.6 +/-    0.49      17.1 +/-    0.49  0.030 / 0.030
G11     138.7          19.5               14.7 +/-    2.29      32.8 +/-    2.29  0.030 / 0.030
G23     158.6          34.7               14.7 +/-    0.78      23.4 +/-    0.78  0.100 / 0.080
G27     49.7           28.8               11.2 +/-    1.92      20.1 +/-    1.92  0.060 / 0.090
G28     242.9          32.8               14.0 +/-    2.14      23.1 +/-    2.14  0.110 / 0.140
G30     308.5          40.7               12.1 +/-    1.26      17.4 +/-    1.26  0.110 / 0.120