userdef xm str nnnsn mouse response, p5 = y-ordinate starting region
userdef xm str nnnsnn mouse response, p6 = x-ordinate starting region
userdef xm str nnnsnnn mouse response, p7 = y-ordinate ending region
userdef xm str nnnsn mouse response, p5 = y-ordinate starting region
userdef xm str nnnsnn mouse response, p6 = x-ordinate starting region
userdef xm str nnnsnnn mouse response, p7 = y-ordinate ending region