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diff --git a/src/spectro_impls.hh b/src/spectro_impls.hh
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+/**
+ * Copyright (c) 2007-2022, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef lnav_spectro_impls_hh
+#define lnav_spectro_impls_hh
+
+#include "log_format.hh"
+#include "spectro_source.hh"
+
+class log_spectro_value_source : public spectrogram_value_source {
+public:
+    log_spectro_value_source(intern_string_t colname);
+
+    void update_stats();
+
+    void spectro_bounds(spectrogram_bounds& sb_out) override;
+
+    void spectro_row(spectrogram_request& sr,
+                     spectrogram_row& row_out) override;
+
+    void spectro_mark(textview_curses& tc,
+                      time_t begin_time,
+                      time_t end_time,
+                      double range_min,
+                      double range_max) override;
+
+    intern_string_t lsvs_colname;
+    logline_value_stats lsvs_stats;
+    time_t lsvs_begin_time{0};
+    time_t lsvs_end_time{0};
+    bool lsvs_found{false};
+};
+
+class db_spectro_value_source : public spectrogram_value_source {
+public:
+    db_spectro_value_source(std::string colname);
+
+    void update_stats();
+
+    void spectro_bounds(spectrogram_bounds& sb_out) override;
+
+    void spectro_row(spectrogram_request& sr,
+                     spectrogram_row& row_out) override;
+
+    void spectro_mark(textview_curses& tc,
+                      time_t begin_time,
+                      time_t end_time,
+                      double range_min,
+                      double range_max) override
+    {
+    }
+
+    std::string dsvs_colname;
+    logline_value_stats dsvs_stats;
+    time_t dsvs_begin_time{0};
+    time_t dsvs_end_time{0};
+    nonstd::optional<size_t> dsvs_column_index;
+    nonstd::optional<lnav::console::user_message> dsvs_error_msg;
+};
+
+#endif