unu join: Connect slices and/or slabs into a bigger nrrd. Can stich images into volumes, or tile images side by side, or attach images onto volumes. Usage: unu join -i <nin0 ...> -a <axis> [-incr] [-o <nout>] -i <nin0 ...> = everything to be joined together (1 or more nrrds) -a <axis> = axis to join along (int) -incr = in situations where the join axis is among the axes of the input nrrds, then this flag signifies that the join axis should be *inserted*, and the output dimension should be one greater than input dimension. Without this flag, the nrrds are joined side-by-side, along an existing axis. -o <nout> = output nrrd (string); default: "-"