PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/22-18:27:50
G01     123.4          13.9               12.8 +/-    1.82      32.8 +/-    1.82  0.070 / 0.080
G07     77.5           64.3               11.8 +/-    0.43      12.9 +/-    0.43  0.040 / 0.070
G08     47.6           35.8                8.8 +/-    0.50      13.8 +/-    0.50  0.030 / 0.040
G09     178.4          33.3               12.7 +/-    2.67      20.9 +/-    2.67  0.020 / 0.030
G11     112.4          38.1               12.3 +/-    0.97      18.5 +/-    0.97  0.030 / 0.040
G13     319.7          15.6                9.0 +/-    2.17      22.0 +/-    2.17  0.030 / 0.040
G17     199.8          19.1               12.9 +/-    1.19      29.1 +/-    1.19  0.140 / 0.430
G18     97.8           18.4               11.4 +/-    1.56      26.2 +/-    1.56  0.150 / 0.390
G28     276.9          51.5               12.3 +/-    1.05      15.2 +/-    1.05  0.090 / 0.280
G30     340.4          65.2               10.9 +/-    0.73      11.9 +/-    0.73  0.090 / 0.300