Very minor changes

splinterpolator.h

@@ -102,7 +102,7 @@ public:
   }
   T ValAndDerivs(double x, double y, double z, std::vector<T>& rderiv) const;
 
-  // Return continous derivative at voxel centres (only works for order<1)
+  // Return continous derivative at voxel centres (only works for order>1)
   T Deriv(const std::vector<unsigned int>& indx, unsigned int ddir) const;
   T Deriv1(const std::vector<unsigned int>& indx) const {return(Deriv(indx,0));}
   T Deriv2(const std::vector<unsigned int>& indx) const {return(Deriv(indx,1));}