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diff --git a/subprojects/exess/src/scientific.h b/subprojects/exess/src/scientific.h
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+/*
+  Copyright 2019-2021 David Robillard <d@drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#ifndef EXESS_SCIENTIFIC_H
+#define EXESS_SCIENTIFIC_H
+
+#include "decimal.h"
+
+#include "exess/exess.h"
+
+#include <stddef.h>
+
+EXESS_CONST_FUNC
+size_t
+exess_scientific_string_length(ExessDecimalDouble value);
+
+ExessResult
+exess_write_scientific(ExessDecimalDouble  value,
+                       size_t              n,
+                       char* EXESS_NONNULL buf);
+
+#endif // EXESS_SCIENTIFIC_H