def detect_byte_width(data, num_voxels, silent):
    """
    Detect byte width.

    :param data: Byte string with DF3 body.
    :param num_voxels: Number of voxels in file.
    :param silent: suppress output (info messages, progress etc.)

    """
    byte_width = int(float(len(data)) / num_voxels)
    if not silent:
        plural = ' s'[byte_width > 1]
        print('Voxel resolution: %d byte%s' % (byte_width, plural))
    return byte_width
