PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-22:42:40
G02     203.9          38.5               16.3 +/-    1.50      24.4 +/-    1.50  0.140 / 0.340
G06     162.0          70.3               14.3 +/-    1.06      15.1 +/-    1.06  0.110 / 0.360
G12     308.0          15.3                8.5 +/-    2.60      21.1 +/-    2.60  0.080 / 0.070
G17     39.2           46.3               10.7 +/-    0.36      14.1 +/-    0.36  0.070 / 0.080
G19     7.8            63.3               10.9 +/-    0.60      12.0 +/-    0.60  0.070 / 0.160
G24     293.1          40.1               12.6 +/-    0.78      18.3 +/-    0.78  0.080 / 0.160
G28     103.1          32.9               13.1 +/-    1.19      21.6 +/-    1.19  0.030 / 0.040