PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-22:43:10
G02     204.1          38.9               14.9 +/-    1.07      22.1 +/-    1.07  0.090 / 0.100
G06     161.3          70.8               13.6 +/-    0.31      14.3 +/-    0.31  0.090 / 0.080
G12     308.2          15.6                9.3 +/-    2.26      22.7 +/-    2.26  0.110 / 0.250
G17     39.6           46.0               10.7 +/-    0.67      14.3 +/-    0.67  0.110 / 0.270
G19     8.6            63.0               11.8 +/-    0.30      13.1 +/-    0.30  0.080 / 0.120
G24     292.5          40.3               16.2 +/-    8.47      23.4 +/-    8.47  0.080 / 0.120
G28     103.6          32.6               12.8 +/-    0.90      21.3 +/-    0.90  0.030 / 0.030