diff --git a/plot_binary_data.py b/plot_binary_data.py
index 78b5a4c..2aca1c7 100755
--- a/plot_binary_data.py
+++ b/plot_binary_data.py
@@ -8,16 +8,12 @@
 ##
 #################################################
 
-## Restrict BLAS/OpenMP to one thread per process so that running
+## Restrict OpenMP to one thread per process so that running
 ## many workers in parallel does not create an O(workers * BLAS_threads)
-## thread explosion.  These variables MUST be set before numpy/scipy
+## thread explosion.  The variable MUST be set before numpy/scipy
 ## are imported, because the BLAS library reads them only at load time.
 import os
 os.environ.setdefault("OMP_NUM_THREADS",        "1")
-os.environ.setdefault("OPENBLAS_NUM_THREADS",   "1")
-os.environ.setdefault("MKL_NUM_THREADS",        "1")
-os.environ.setdefault("VECLIB_MAXIMUM_THREADS", "1")
-os.environ.setdefault("NUMEXPR_NUM_THREADS",    "1")
 
 import numpy
 import scipy