[phenixbb] phenix 1.3-rc4 vs. phenix 1.3-final

Hi, I have done a couple of refinements using either phenix.refine 1.3-rc4 or phenix.refine 1.3-final. And phenix.refine 1.3-rc4 always gave me a lower Rfree, about 1% lower than phenix.refine 1.3-final, which actually is pretty big. What has changed between this two versions? -- Jianghai