◁think▷I need to write a 50–80 word English description of the composite LF-NMR image of apple #521, focusing on internal moisture distribution, tissue structure, signal intensity, and patch morphology. I should not use certain prohibited words like 'healthy', 'diseased', 'mild', 'severe', 'normal', 'abnormal', 'ground-truth', or 'label'. I should only provide a plain descriptive text without any extra explanations or JSON.

Let me analyze the image and think about what I can describe:

1. Internal moisture distribution: The image shows variations in gray levels, which likely correspond to different moisture content. Some areas appear lighter (possibly drier) while others are darker (more moist).

2. Tissue structure: The circular patterns suggest cross-sections of apple tissue. The textures vary between smoother areas and more granular/mottled regions.

3. Signal intensity: In LF-NMR imaging, signal intensity typically correlates with moisture content. The varying shades likely represent different signal intensities.

4. Patch morphology: There appear to be distinct patches or regions within the apple tissue. Some areas have concentrated darker regions (possibly higher moisture or different tissue composition), while others are more uniform.

Now I'll craft a descriptive paragraph that covers these aspects without using prohibited terms. I'll focus on objective observations about the image's appearance and what they might imply about the apple's internal state.◁/think▷The composite LF-NMR image of apple #521 displays distinct regional variations in grayscale intensity across its cross-sectional planes. Central tissue regions exhibit moderately high signal intensity with relatively uniform texture, suggesting localized moisture accumulation. Peripheral areas demonstrate lower signal intensity with increased granularity, indicating potential desiccation or structural differences. Concentrated circular regions within the tissue matrix display intermediate signal levels and finer granularity compared to surrounding zones. The overall morphology features irregular boundaries between tissue types, with patchy distributions of moisture and varying cellular density patterns evident in the grayscale contrast.