PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-18:28:10
G01     124.5          13.0               14.8 +/-    1.32      38.6 +/-    1.32  0.030 / 0.040
G07     74.1           65.0               13.1 +/-    0.21      14.3 +/-    0.21  0.030 / 0.040
G08     48.4           36.9               10.8 +/-    0.71      16.6 +/-    0.71  0.030 / 0.040
G09     178.6          34.8               12.7 +/-    1.23      20.2 +/-    1.23  0.030 / 0.040
G11     114.0          37.4               14.2 +/-    0.88      21.6 +/-    0.88  0.060 / 0.080
G13     320.1          14.5                9.9 +/-    3.26      25.0 +/-    3.26  0.070 / 0.090
G17     199.6          17.7               13.8 +/-    1.79      32.1 +/-    1.79  0.110 / 0.390
G18     99.1           17.7               12.7 +/-    2.70      29.5 +/-    2.70  0.120 / 0.400
G28     274.9          50.8               13.1 +/-    1.10      16.3 +/-    1.10  0.120 / 0.380
G30     338.4          64.1               12.2 +/-    0.52      13.4 +/-    0.52  0.130 / 0.400