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diff --git a/src/catch2/benchmark/catch_estimate.hpp b/src/catch2/benchmark/catch_estimate.hpp
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+++ b/src/catch2/benchmark/catch_estimate.hpp
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+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+// Adapted from donated nonius code.
+
+#ifndef CATCH_ESTIMATE_HPP_INCLUDED
+#define CATCH_ESTIMATE_HPP_INCLUDED
+
+namespace Catch {
+    namespace Benchmark {
+        template <typename Type>
+        struct Estimate {
+            Type point;
+            Type lower_bound;
+            Type upper_bound;
+            double confidence_interval;
+        };
+    } // namespace Benchmark
+} // namespace Catch
+
+#endif // CATCH_ESTIMATE_HPP_INCLUDED