I goofed. Having finished milling rails and stiles for cabinet doors out of poplar, I stacked the pieces for each door on top of one another overnight. They were stacked on an open grid. In the morning I found that the rails had bowed ~1/16" per foot, apparently losing moisture on the top of the upper piece and the bottom of the lower piece. I've unstacked them and all of the parts have air movement all around, but after three days, they've kept the same bowed attitude.
Any suggestions on how to go about straightening out the situation? I've read articles about using steam irons and such, but it seems pretty unpredictable...
P.S. I had first roughly sized the lumber after purchase and stacked it stickered for two weeks before the final milling.