import Data.Maybe ( fromJust )
import GHC.Conc ( getNumProcessors, setNumCapabilities )
import System.IO ( hPutStrLn, stderr )
-import System.Exit ( exitSuccess, exitWith, ExitCode(..) )
-
-import CommandLine ( Args(..), apply_args )
-import ExitCodes
+import System.Exit (
+ ExitCode( ExitFailure ),
+ exitSuccess,
+ exitWith )
+
+import CommandLine (
+ Args(Args, depth, height, input, lower_threshold, output,
+ scale, slice, upper_threshold, width),
+ apply_args )
+import ExitCodes ( exit_arg_not_positive, exit_arg_out_of_bounds )
import Grid ( zoom )
import Volumetric (
bracket_array,