Depth map for a stereogram, 9:16 vertical, 2K resolution. Pure grayscale depth map ONLY (no color, no texture, no pattern). Solid BLACK background (0,0,0) representing far distance. A single centered STATIC silhouette of a MERMAID rendered in solid mid-gray (60-80% gray value, NOT pure white) representing the near/raised object. Classic clear mermaid pose: long flowing hair, human upper body, curved fish tail with fin at the bottom, arms gently posed. The silhouette must be a clean simple recognizable shape occupying about 55-65% of the frame, centered. Add a very subtle soft gradient inside the silhouette — slightly brighter at the body center, slightly darker toward the edges — with a soft 3-5px feathered edge for smooth readable depth. No facial details, no fine internal lines, no text, no outline strokes. Smooth, minimal, high-contrast between the black background and the gray mermaid. This is a technical grayscale depth map for autostereogram generation.
