diff --git a/calcos/accum.py b/calcos/accum.py
index ac7c53a..556be6d 100644
--- a/calcos/accum.py
+++ b/calcos/accum.py
@@ -1,18 +1,12 @@
 from __future__ import absolute_import, division         # confidence high
-import copy
-import math
 import shutil
-import time
-import types
 import numpy as np
-from numpy import random
 import astropy.io.fits as fits
 
 from . import cosutil
 from . import ccos
 from . import phot
 from . import timetag                  # actually for more generic functions
-from . import wavecal
 from .calcosparam import *       # parameter definitions
 
 def accumBasicCalibration(input, inpha, outtag,
diff --git a/calcos/calcos.py b/calcos/calcos.py
index f59e795..0e2d57f 100755
--- a/calcos/calcos.py
+++ b/calcos/calcos.py
@@ -20,7 +20,6 @@
 from . import shiftfile
 from . import spwcs
 from . import timetag
-from . import trace
 from . import wavecal
 from .calcosparam import *       # parameter definitions
 
diff --git a/calcos/cosutil.py b/calcos/cosutil.py
index a9d896a..e5b4138 100755
--- a/calcos/cosutil.py
+++ b/calcos/cosutil.py
@@ -6,7 +6,6 @@
 import shutil
 import sys
 import time
-import types
 import copy
 import numpy as np
 import numpy.linalg as LA
diff --git a/calcos/extract.py b/calcos/extract.py
index 136b086..03d65b6 100644
--- a/calcos/extract.py
+++ b/calcos/extract.py
@@ -3,7 +3,6 @@
 import os
 import numpy as np
 import astropy.io.fits as fits
-from astropy.stats import poisson_conf_interval
 from . import cosutil
 from . import ccos
 from . import dispersion
diff --git a/calcos/fpavg.py b/calcos/fpavg.py
index 0aa943f..b8c93a6 100644
--- a/calcos/fpavg.py
+++ b/calcos/fpavg.py
@@ -1,5 +1,4 @@
 from __future__ import absolute_import, division         # confidence high
-import copy
 import math
 import numpy as np
 import astropy.io.fits as fits
diff --git a/calcos/getinfo.py b/calcos/getinfo.py
index 4fdad14..226a8a6 100644
--- a/calcos/getinfo.py
+++ b/calcos/getinfo.py
@@ -1,5 +1,4 @@
 from __future__ import absolute_import, division         # confidence high
-import os
 import astropy.io.fits as fits
 from . import cosutil
 from .calcosparam import *
diff --git a/calcos/trace.py b/calcos/trace.py
index 2f99fe5..d91abe4 100644
--- a/calcos/trace.py
+++ b/calcos/trace.py
@@ -5,7 +5,6 @@
 #
 
 from __future__ import division, absolute_import
-import astropy.io.fits as fits
 import numpy as np
 import math
 
diff --git a/calcos/x1d.py b/calcos/x1d.py
index 298d664..aba9c0b 100755
--- a/calcos/x1d.py
+++ b/calcos/x1d.py
@@ -3,10 +3,8 @@
 from __future__ import absolute_import, division, print_function # confidence high
 import os
 import sys
-import string
 import getopt
 
-import numpy as np
 import astropy.io.fits as fits
 
 from . import calcosparam                      # parameter definitions