What version of MotionCorr should be used with RELION 2.0.1? I am following the tutorial and I'm getting the following errors: WARNING: there was an error executing: /usr/local/apps/RELION2.0/motioncorr_v2.1/bin/dosefgpu_driftcorr -InMrc Micrographs/Falcon_2012_06_12-14_33_35_0_movie.mrcs -OutMrc MotionCorr/job002/Micrographs/Falcon_2012_06_12-14_33_35_0.mrc -OutStack 1 -Patch 1 1 -Gpu 0 >> MotionCorr/job002/Micrographs/Falcon_2012_06_12-14_33_35_0.out 2>> MotionCorr/job002/Micrographs/Falcon_2012_06_12-14_33_35_0.err In the .out file, $ cat MotionCorr/job002/Micrographs/Falcon_2012_06_12-16_55_40_0.out Undefined option: Micrographs/Falcon_2012_06_12-16_55_40_0_movie.mrcs .Abort. Error: Failed to read parameters. Abort! I have v2.1 of MotionCorr. The options -InMrc, -OutMrc, -OutStack, -Patch, don't exist: $ /usr/local/apps/RELION2.0/motioncorr_v2.1/bin/dosefgpu_driftcorr Dose Fractionation Tool: Drift correction v2.1 (Nov 21, 2013) Input: InputStack.mrc [OPTION VALUE] ... *Note: If OPTION isn't specified, the default value will be used. OPTION VALUE(Default) Introduction -crx 0 Image crop offset X -cry 0 Image crop offset Y -cdx 0 Image crop dimension X. 0: Use maximum size. -cdy 0 Image crop dimension Y. 0: Use maximum size. -bin 1 1 or 2. Bin stack before processing, only 1x and 2x binning -nst 0 First frame (0-base) used in alignment. -ned 0 Last frame (0-base) used in alignment. 0: Use maximum value. -nss 0 First frame (0-base) used for final sum. -nes 0 Last frame (0-base) used for final sum. 0: Use maximum value. -gpu 0 GPU device ID. -bft 150 BFactor in pix^2. -pbx 96 Box dimension for searching CC peak. -fod 2 Number of frame offset for frame comparision. -nps 0 Radius of noise peak. -kit 1.0 Threshold of alignment error in pixel. -hgr 1 1: Use gain reference in MRC header(MRC mode 5 only). 0: No. -fgr FileName.mrc Gain reference. Applied when specified. -fdr FileName.mrc Dark reference. Applied when specified. -srs 0 1: Save uncorrected sum. 0: No. -ssr 0 1: Save uncorrected stack. 0: No. -ssc 0 1: Save corrected stack. 0: No. -scc 0 1: Save CC Map. 0: No. -slg 1 1: Save Log. 0: No. -atm 1 1: Align to middle frame N/2+1. 0: No. <0: to |VALUE|. -dsp 1 1: Save quick results. 0: No. -fsc 0 1: Calculate FSC. 0: No. -frs FileName.mrc Uncorrected sum -frt FileName.mrc Uncorrected stack -fcs FileName.mrc Corrected sum -fct FileName.mrc Corrected stack -fcm FileName.mrc CC map -flg FileName.txt Log file Additional Notes: 1) MRC mode 5 was defined based on standard MRC format as following: a) A 32-bit-float Gain Reference is stored in the end of MRC extended header(Symmetry Data). b) Dark-subtracted frames is in format of unsigned 8-bit integer (unsigned char). 2) If both -hgr and -fgr are enabled, -fgr will be disabled. Wrote by Xueming Li @ Yifan Cheng Lab, UCSF Any hints would be helpful. Cheers, David Hoover HPC @ NIH