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\"pixels_per_mm_projector\": 4.2317657470703125,\n \"real_world_ref_mm\": 5.0,\n \"scale_image_path\": \"/home/jeremy/orange_data/calibrations/sessions/calsess_2026_08_10T01_53_54Z_shadow/artifacts/Cam2010096_arena_4/scale_observations/calgrp_2026_08_10T01_53_53Z_shadow_projected_surface_scale_calibration_projected_surface_g1/observation.json\",\n \"status\": \"accepted\",\n \"target_plane\": \"projected_surface\"\n }\n ]\n }\n ],\n \"config_name\": \"arena_4\",\n \"dish_config\": {\n \"biological\": {\n \"adult_eye_height_mm\": 8.0,\n \"larvae_eye_height_mm\": 8.0,\n \"media_type\": \"E3 embryo medium\",\n \"water_fill_depth_mm\": 5.0\n },\n \"dimensions\": {\n \"diameter_mm\": 80.0,\n \"diffuser_sandwich_mm\": 0.0,\n \"dish_base_thickness_mm\": 5.0,\n \"projector_base_thickness_mm\": 4.760000228881836,\n \"wall_height_mm\": 3.0\n },\n \"dish_name\": \"palm2\",\n \"dish_shape\": \"circular\",\n \"dish_type\": 3,\n \"materials\": {\n \"air_refractive_index\": 1.0,\n \"base_material\": 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