Fix base_config -> package_config reference in surface.py.

diff --git a/pypiezo/surface.py b/pypiezo/surface.py
index 0145b23eff333d08db07fb3f5cfb1a696b1d488e..7da39d408c14135b6e0dc22387f02cf3b31002b3 100644 (file)
--- a/pypiezo/surface.py
+++ b/pypiezo/surface.py
@@ -35,6 +35,7 @@ except (ImportError, RuntimeError), e:
     _matplotlib_import_error = e
 
 from . import LOG as _LOG
+from . import package_config as _package_config
 from . import base as _base
 
 
@@ -207,7 +208,7 @@ def analyze_surface_position_data(
         full_output=True, maxfev=10000)
     _LOG.debug('best fit parameters: %s' % (params,))
 
-    if _base_config['matplotlib']:
+    if _package_config['matplotlib']:
         if not _matplotlib:
             raise _matplotlib_import_error
         figure = _matplotlib_pyplot.figure()