3D Backprojection using PubSub

1. Login to master node of cluster, where PubSub has been installed and is running, e.g.:
   ssh   radha
2. Access your working_dir from the master node, e.g.:
   cd   /usr11/user/bp
3. Create input and output sub-directories as necessary, e.g.:
   mkdir   input   output
4. Copy all the necessary input data files, i.e.:
   Image selection doc. file(s),
   Projection angles doc. file(s)
   Aligned projections
   to the input directory e.g.:
   scp    '/user/bp/angles_both.dat'   input
   scp    '/user/bp/sel003.dat'     input
   scp    '/user/bp/k35_rtsq_*.dat'   input
5. Copy bp3d_slab_pub.spi procedure file to the working directory, e.g.:
   scp -v    '/usr8/spider/proc/bp3d_slab_pub.spi'    .
   
6. Edit bp3d_slab_pub.spi to set necessary values for input parameters and input file names, e.g.
   xedit   bp3d_slab_pub.spi
   The Number of slabs/nodes, and the dimensions are determined by input image dimensions.
7. Copy a specific SPIDER to your working directory (ensures that same SPIDER executable is used throughout whole run), e.g.:
   cp /usr8/spider/bin/spider_linux_mpfftw_opt64.18.15.5    spider
8. Start Master SPIDER process bp3d_slab_pub.spi, e.g.
   ./spider spi/dat    @bp3d_slab_pub 0 &
9. Master SPIDER refinement process will create and publish new SPIDER jobs as necessary.