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    const int top_margin;
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    const int top_margin;
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    const int bottom_margin;
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    const int bottom_margin;
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    const int plot_height;
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    const int plot_height;
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    /// @brief persistent storage - a trail of pixels follow the plotted point. .
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    /// @brief persistent storage - a trail of pixels follow the plotted point. .
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    static unsigned const PERSIST= 40;
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    static unsigned const PERSIST= 300;
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    uint8_t persist_x[PERSIST];
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    uint8_t persist_x[PERSIST];
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    uint8_t persist_y[PERSIST];
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    uint8_t persist_y[PERSIST];
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    // large enough to hold value 0..PERSIST-1
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    uint8_t next_persist;
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    uint16_t next_persist;
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};
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};
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