Describe this image factually for a knowledge-base index. Surrounding text below tells you what topic the image relates to.

--- Text before image ---
{before}

--- Text after image ---
{after}

--- End surrounding text ---

If the image is clearly NOT relevant to the surrounding text, prepend "[OFF-TOPIC] " to your response. Otherwise, describe factually: visible text verbatim, chart axes and values, diagram structure, key visual elements. 2 to 4 sentences. Plain text only — no markdown, no preamble.