Heading into the close, the FN 4.0 is trading +0-02 at 99-09 yielding 4.078% and the FN 4.5 is +0-02 at 101-24 yielding 4.286%. The secondary market current coupon (CC) is 4.13%. The CC is +78/10yr TSY and +67/10yr swap.

As you can see in the chart below,  after prices fell early in the week, "rate sheet influential" MBS prices haven't made much progress in either direction with most of the price action occurring between 101-26 and 101-20. This should continue into today's close.

Again...lock!