set term pdf enhanced color font "helvetica,20" linewidth 1 size 10,6
set output "phase_func.pdf"
set nologscale
set polar
 set xrange [-7.224E-002:4.163E-001]
 set yrange [-1.625E-001:1.625E-001]
plot \
     "./rdgfa_phase_function.txt" u 1:2 title "RDG-FA" w lines lt rgb "blue" lw 1 \
    ,"./rdgfa_phase_function.txt" u ($1*(-1)):2 notitle w lines lt rgb "blue" lw 1 \
     
quit
