-import Data.Maybe (isJust)
-import GHC.Conc (getNumProcessors, setNumCapabilities)
-import System.IO (hPutStrLn, stderr)
-import System.Exit (exitSuccess, exitWith, ExitCode(..))
-
-import CommandLine (Args(..), apply_args)
-import ExitCodes
-import Grid (zoom)
-import MRI (
+import Data.Maybe ( fromJust )
+import GHC.Conc ( getNumProcessors, setNumCapabilities )
+import System.IO ( hPutStrLn, stderr )
+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,