|BP 3D||[Back Projection - 3D, using Euler angles ||]|
|BP CG||[Back Projection - 3D, Iterative, Conjugate Gradients ||*]|
|BP RP||[Back Projection - 3D, iterative, Richardson, constrained ||*]|
|BP S2||[Back Projection - 2D, single tilt, iterative, constrained ||]|
|BP W2||[Back Projection - 2D, filtered, weighted ||]|
.TEMPLATE FOR 2-D OUTPUT FILES: PRW***
[Enter the prefix of the weighted projection file series.]
.SELECTION DOC FILE: SEL_SERIES_001
[Enter selection document file name containing the numbers of the input images in the first register column.]
.CUT-OFF FREQUENCY FOR PARZEN FILTER: 0.25
[For cut-off equal zero, R**2 weighting and no filter is applied.
For cut-off larger than zero, R**2 weighting and Parzen filter is applied.
For cut-off equal -1.0, R* weighting and no filter is applied.
For cut-off smaller than zero, R* weighting and Parzen filter (with positive cut-off) is applied.]