hyperbola h 5 -1 0 1 1 0.5
trim h h -1 1
copy h hr
2dtranslate hr 0 -4
reverse hr
convert result hr
2dpl 
2dpl
2dpu
2dpu
checklength result -l 1.6539462322641865
checkview -display result -2d -path ${imagedir}/${test_image}.png