{"artifact_id":"L2-046-001","layer":"L2","parent_l1":"L1-046","title":"Doppler Ultrasound (color / spectral) Mismatch-Only Spec","omega":{"dims":{"f_MHz":[1,15],"SNR_dB":[0.0,35.0],"PRF_kHz":[0.5,20],"aliasing":[0.0,0.5],"depth_cm":[1,25],"N_elements":[32,256],"angle_correction":[0.0,0.5],"low_velocity_sensitivity":[0.0,0.3],"wall_filter_bleedthrough":[0.0,0.3]},"type":"range"},"epsilon":{"type":"fn","expression":"16.0 + 0.3 * SNR_dB - 8.0 * angle_correction - 6.0 * aliasing - 4.0 * wall_filter_bleedthrough"},"difficulty_score":0.5,"delta_tier":5,"fingerprint":"8a2eec7d4a3051bb2db1f0a6b2bcddece3433f7f777eebde8ead0c550f74891e","status":"testnet","submitted_by":"mainnet_mirror","chain_hash":"0x20dec2341d2839dd6a8baf6742d2c004bdcffa2730939354b95a95ccb705a1d4","chain_tx_hash":"0x49f656572906e99af36d0ac2ea75b63deeed15a782eaf1712482a634cbe91bc0","chain_block":41553361}