usage:
    genice II -f twist[options:separated:by:colons] > file

Output the twist values for all the hydrogen-bonded pairs.

options:
    png      Draw the hydrogen bonds with a rainbow palette according to the twist value in PNG format.
    png:CM   Draw the hydrogen bonds with color-mixing scheme in PNG format.
    png:DB   Draw the hydrogen bonds with decision-boundary coloring scheme in PNG format.
    png:SB   Draw the hydrogen bonds with simple boundary coloring scheme in PNG format.
    svg      Draw the hydrogen bonds with a rainbow palette according to the twist value in SVG format.
    svg:CM   Draw the hydrogen bonds with color-mixing scheme in SVG format.
    svg:DB   Draw the hydrogen bonds with decision-boundary coloring scheme in SVG format.
    svg:SB   Draw the hydrogen bonds with simple boundary coloring scheme in SVG format.
    yaplot   Draw the hydrogen bonds with a rainbow palette according to the twist value in YaPlot format.
    shadow   Draw shadows to the atoms (PNG and SVG)
    Ih=filename.twhist   Specify the (two-dimensional) histogram of twist parameter in pure ice Ih.
    Ic=filename.twhist   Specify the (two-dimensional) histogram of twist parameter in pure ice Ic.
    LDL=filename.twhist  Specify the (two-dimensional) histogram of twist parameter in pure LDL.
    HDL=filename.twhist  Specify the (two-dimensional) histogram of twist parameter in pure HDL.
    rotatex=30   Rotate the picture (SVG and PNG)
    rotatey=30   Rotate the picture (SVG and PNG)
    rotatez=30   Rotate the picture (SVG and PNG)