= {
" ",
"Usage: btube [options] input.img output.img",
"-------------------------------------------",
"Symmetrizes helical tubes with hexagonal lattices.",
" ",
"Actions:",
"-lattice 5,9 Lattice parameters (units along u and v vectors).",
"-normalize Normalize symmetrized output, use for maps close to symmetry (default not).",
"-background Calculate new background values.",
"-rescale -0.1,5.2 Rescale data to average and standard deviation.",
" ",
"Parameters:",
"-verbose 1 Verbosity of output.",
"-datatype u Force writing of a new data type.",
"-sampling 1.5,1.5,1.5 Sampling (A/pixel; a single value can be given).",
"-origin 110,50,44 Origin for tube (default 0,0,0 or from image).",
"-constant 95 Lattice constant: distance between units in angstrom (default 1).",
"-zlimits 8,47 Range of slices along the helical axis to use (default 0,inf).",
"-radius 22 Radial limit for symmetrization in pixels (default from image).",
" ",
NULL
}