diff --git a/include/algorithms/public/Grid.hpp b/include/algorithms/public/Grid.hpp
index 30971a627..db43b6a88 100644
--- a/include/algorithms/public/Grid.hpp
+++ b/include/algorithms/public/Grid.hpp
@@ -47,7 +47,6 @@ class Grid
     double   area = (xMax - xMin) * (yMax - yMin);
     double   size = static_cast<double>(N);
     double   step = sqrt(area / M);
-    index    numCols, numRows;
 
     if (area <= 0) return DataSet();
 
@@ -100,8 +99,14 @@ class Grid
     return result;
   }
 
+  std::pair<index, index> const getGridMax() {
+    return {numCols,numRows};
+  }
+
 private:
   Assign2D assign2D;
+index numCols{0}; 
+indes numRows{0};  
 };
 }; // namespace algorithm
 }; // namespace fluid
diff --git a/include/clients/nrt/GridClient.hpp b/include/clients/nrt/GridClient.hpp
index 349f05174..78f959fb6 100644
--- a/include/clients/nrt/GridClient.hpp
+++ b/include/clients/nrt/GridClient.hpp
@@ -32,6 +32,7 @@ class GridClient : public FluidBaseClient, OfflineIn, OfflineOut, ModelObject
   using string = std::string;
   using BufferPtr = std::shared_ptr<BufferAdaptor>;
   using StringVector = FluidTensor<string, 1>;
+  using IndexPair = std::tuple<index,index>;
 
   template <typename T>
   Result process(FluidContext&)
@@ -56,21 +57,22 @@ class GridClient : public FluidBaseClient, OfflineIn, OfflineOut, ModelObject
 
   GridClient(ParamSetViewType& p) : mParams(p) {}
 
-  MessageResult<void> fitTransform(DataSetClientRef sourceClient,
+  MessageResult<IndexPair> fitTransform(DataSetClientRef sourceClient,
                                    DataSetClientRef destClient)
   {
     auto srcPtr = sourceClient.get().lock();
     auto destPtr = destClient.get().lock();
-    if (!srcPtr || !destPtr) return Error(NoDataSet);
+    if (!srcPtr || !destPtr) return Error<IndexPair>(NoDataSet);
     auto src = srcPtr->getDataSet();
     auto dest = destPtr->getDataSet();
-    if (src.dims() != 2) return Error("Dataset should be 2D");
-    if (src.size() == 0) return Error(EmptyDataSet);
+    if (src.dims() != 2) return Error<IndexPair>("Dataset should be 2D");
+    if (src.size() == 0) return Error<IndexPair>(EmptyDataSet);
     FluidDataSet<string, double, 1> result;
     result = mAlgorithm.process(src,
         get<kResample>(), get<kExtent>(), get<kAxis>());
     destPtr->setDataSet(result);
-    return OK();
+    IndexPair casted = mAlgorithm.getGridMax();
+    return {casted};
   }
 
   static auto getMessageDescriptors()