I study here erythromycin-ratiopharm 1000 mg db Two-year yields have clawed back some ground after anaggressive sell-off last week but they have yet to unwind theirsharp underperformance of longer-term debt. The Portuguese yieldcurve remains at its flattest since April 2012, reflectinginvestor concerns that the country might have to restructure itsdebt in the future.