b=1.414 B=2 m=20 MARKED: status optimal  beta=0.989731  (beta1=0.984821, g22(0)/2=1.9861, g12hat(0)=1.9812)  value 1-M/beta with M from window
   check: min g11 -1.37e-09  min g12 -4.08e-06  min g22 -1.29e-05 (x in (0,30))
   check: min eigenvalue of Hhat on fine xi grid -1.27e-06 (at xi=0.6238)
