Adapt vv for negative eigenvals and marriot for zero determinant
Adapt vv for negative eigenvals and marriot for zero determinant

catterbu/receptormarker,nsh87/receptormarker,catterbu/receptormarker,catterbu/receptormarker,catterbu/receptormarker,nsh87/receptormarker,catterbu/receptormarker,nsh87/receptormarker,nsh87/receptormarker,nsh87/receptormarker