diff --git a/atrip.org b/atrip.org
index 8d06e58..e38133b 100644
--- a/atrip.org
+++ b/atrip.org
@@ -549,6 +549,8 @@ namespace atrip {
 #include <atrip/Slice.hpp>
 
 namespace atrip {
+
+  template <typename F=double>
   struct RankMap {
 
     std::vector<size_t> const lengths;
@@ -561,7 +563,7 @@ namespace atrip {
                             1UL, std::multiplies<size_t>()))
     { assert(lengths.size() <= 2); }
 
-    size_t find(Slice::Location const& p) const noexcept {
+    size_t find(typename Slice<F>::Location const& p) const noexcept {
       return p.source * np + p.rank;
     }
 
@@ -581,10 +583,10 @@ namespace atrip {
       return source == nSources() && isPaddingRank(rank);
     }
 
-    Slice::Location
-    find(ABCTuple const& abc, Slice::Type sliceType) const noexcept {
+    typename Slice<F>::Location
+    find(ABCTuple const& abc, typename Slice<F>::Type sliceType) const noexcept {
       // tuple = {11, 8} when abc = {11, 8, 9} and sliceType = AB
-      const auto tuple = Slice::subtupleBySlice(abc, sliceType);
+      const auto tuple = Slice<F>::subtupleBySlice(abc, sliceType);
 
       const size_t index
         = tuple[0]