PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/26-18:27:50
G01     117.2          18.5               25.1 +/-    2.71      57.2 +/-    2.71  0.030 / 0.060
G07     92.9           60.1               12.4 +/-    0.89      14.0 +/-    0.89  0.030 / 0.060
G08     44.2           29.7                9.4 +/-    0.72      16.5 +/-    0.72  0.040 / 0.060
G09     177.4          25.8               12.9 +/-    1.31      24.8 +/-    1.31  0.030 / 0.060
G11     103.2          41.1               14.1 +/-    0.99      20.1 +/-    0.99  0.040 / 0.040
G13     316.6          21.4               10.0 +/-    3.75      21.4 +/-    3.75  0.040 / 0.040
G17     201.3          26.4               15.0 +/-    1.31      28.5 +/-    1.31  0.140 / 0.310
G18     90.4           21.2               11.9 +/-    0.90      25.4 +/-    0.90  0.130 / 0.340
G28     288.5          55.1               13.7 +/-    0.63      16.3 +/-    0.63  0.090 / 0.240
G30     353.8          71.3               12.6 +/-    1.09      13.2 +/-    1.09  0.100 / 0.180