diff --git a/src/IO/Observer/ReductionActions.cpp b/src/IO/Observer/ReductionActions.cpp
index 48167ec716c2..ea7677d412ba 100644
--- a/src/IO/Observer/ReductionActions.cpp
+++ b/src/IO/Observer/ReductionActions.cpp
@@ -21,4 +21,10 @@ void append_to_reduction_data(
   all_reduction_data->insert(all_reduction_data->end(), t.begin(), t.end());
 }
 
+void append_to_reduction_data(
+    const gsl::not_null<std::vector<double>*> all_reduction_data,
+    const std::array<double, 3>& t) {
+    all_reduction_data->insert(all_reduction_data->end(), t.begin(), t.end());
+}
+
 }  // namespace observers::ThreadedActions::ReductionActions_detail
diff --git a/src/IO/Observer/ReductionActions.hpp b/src/IO/Observer/ReductionActions.hpp
index 842d643c351c..bfa5e81856f9 100644
--- a/src/IO/Observer/ReductionActions.hpp
+++ b/src/IO/Observer/ReductionActions.hpp
@@ -229,6 +229,10 @@ void append_to_reduction_data(
     const gsl::not_null<std::vector<double>*> all_reduction_data,
     const std::vector<double>& t);
 
+void append_to_reduction_data(
+    gsl::not_null<std::vector<double>*> all_reduction_data,
+    const std::array<double, 3>& t);
+
 template <typename... Ts, size_t... Is>
 void write_data(const std::string& subfile_name,
                 const std::string& input_source,
diff --git a/src/ParallelAlgorithms/ApparentHorizonFinder/HorizonAliases.hpp b/src/ParallelAlgorithms/ApparentHorizonFinder/HorizonAliases.hpp
index b22f4a60351a..ab9d017d107a 100644
--- a/src/ParallelAlgorithms/ApparentHorizonFinder/HorizonAliases.hpp
+++ b/src/ParallelAlgorithms/ApparentHorizonFinder/HorizonAliases.hpp
@@ -41,9 +41,8 @@ using tags_for_observing = tmpl::list<
     gr::surfaces::Tags::IrreducibleMassCompute<Frame>,
     ylm::Tags::MaxRicciScalarCompute, ylm::Tags::MinRicciScalarCompute,
     gr::surfaces::Tags::ChristodoulouMassCompute<Frame>,
-    gr::surfaces::Tags::DimensionlessSpinMagnitudeCompute<Frame>
-    // Needs `ObserveTimeSeriesOnSurface` to be able to write a `std::array`
-    // gr::surfaces::Tags::DimensionlessSpinVectorCompute<Frame, Frame>
+    gr::surfaces::Tags::DimensionlessSpinMagnitudeCompute<Frame>,
+    gr::surfaces::Tags::DimensionfulSpinVectorCompute<Frame, Frame>
     >;
 
 using surface_tags_for_observing = tmpl::list<ylm::Tags::RicciScalar>;
diff --git a/src/ParallelAlgorithms/Interpolation/Callbacks/ObserveTimeSeriesOnSurface.hpp b/src/ParallelAlgorithms/Interpolation/Callbacks/ObserveTimeSeriesOnSurface.hpp
index 679192322f05..d902c360afb4 100644
--- a/src/ParallelAlgorithms/Interpolation/Callbacks/ObserveTimeSeriesOnSurface.hpp
+++ b/src/ParallelAlgorithms/Interpolation/Callbacks/ObserveTimeSeriesOnSurface.hpp
@@ -40,9 +40,35 @@ namespace callbacks {
 
 namespace detail {
 
+template<typename T>
+struct is_array_of_double : std::false_type {};
+
+template<std::size_t N>
+struct is_array_of_double<std::array<double, N>> : std::true_type {};
+
 template <typename... Ts>
 auto make_legend(tmpl::list<Ts...> /* meta */) {
-  return std::vector<std::string>{"Time", db::tag_name<Ts>()...};
+    std::vector<std::string> legend = {"Time"};
+
+    auto append_tags = [&legend](auto tag) {
+        using TagType = decltype(tag);
+        using ReturnType = typename TagType::type;
+
+        if constexpr (is_array_of_double<ReturnType>::value) {
+            constexpr std::array<const char*, 3> suffix = {"_x", "_y", "_z"};
+            for (size_t i = 0; i < std::tuple_size<ReturnType>::value; ++i) {
+                legend.push_back(db::tag_name<TagType>() + gsl::at(suffix, i));
+            }
+        }
+        else {
+            legend.push_back(db::tag_name<TagType>());
+        }
+
+    };
+
+    (append_tags(Ts{}), ...);
+
+    return legend;
 }
 
 template <typename DbTags, typename... Ts>
diff --git a/src/PointwiseFunctions/GeneralRelativity/Surfaces/Spin.cpp b/src/PointwiseFunctions/GeneralRelativity/Surfaces/Spin.cpp
index 1b86947e0bbc..cd74d0120fbd 100644
--- a/src/PointwiseFunctions/GeneralRelativity/Surfaces/Spin.cpp
+++ b/src/PointwiseFunctions/GeneralRelativity/Surfaces/Spin.cpp
@@ -636,7 +636,7 @@ GENERATE_INSTANTIATIONS(INSTANTIATE,
 
 GENERATE_INSTANTIATIONS(INSTANTIATE,
                         (Frame::Grid, Frame::Distorted, Frame::Inertial),
-                        (Frame::Inertial))
+                        (Frame::Inertial, Frame::Distorted))
 #undef INSTANTIATE
 #undef MEASUREMENTFRAME
 #undef METRICFRAME