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Beyond a mapping's SIP capacity (16/C) the throughput plateaus: extra users run in waves at the saturated rate, they are not un-runnable. Draw a dashed horizontal extension at the ceiling so 1-kv-per-cube (cap 2) reads as saturating, not stopping, at B=2. Caption updated. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>