update of name to lowercase

gridded/da/carbondioxide/statevector.py

@@ -54,8 +54,8 @@ class CO2StateVector(StateVector):
             else:
                 logging.info("Using covariance file: %s" % fil)
 
-        f_ocn = io.CT_Read(file_ocn_cov, 'read')
-        f_bio = io.CT_Read(file_bio_cov, 'read')
+        f_ocn = io.ct_read(file_ocn_cov, 'read')
+        f_bio = io.ct_read(file_bio_cov, 'read')
 
         cov_ocn = f_ocn.get_variable('CORMAT')
         if f_bio.variables.has_key('covariance'):
@@ -111,7 +111,7 @@ class CO2StateVector(StateVector):
         """
         
 
-        f = io.CT_Read(filename, 'read')
+        f = io.ct_read(filename, 'read')
 
         for n in range(self.nlag):
             if qual == 'opt':