(Check out Carter’s worthcharting.com for actionable recommendations and live nightly videos.) Here are some downside reference points for the market. There are two identical S & P 500 charts below for your consideration. Further weakness here would put the middle of the market’s three-year channel “in play.” A sell-off to the middle of the market’s three-year channel would represent an 11.25% selloff from the market’s peak of February 19. Our view is that the S & P 500 will decline to the middle of the market’s 3-year channel. And if and as the sell-off gathers steam, the lower band of the market’s 3-year channel would be “in play”. A move to the lower band would represent a 16.95% sell-off from the market’s peak of February 19. Our view is that the S & P 500 is highly likely to decline to the lower band of the market’s 3-year channel. DISCLOSURES: (None) All opinions expressed by the CNBC Pro contributors are solely their opinions and do not reflect the opinions of CNBC, NBC UNIVERSAL, their parent company or affiliates, and may have been previously disseminated by them on television, radio, internet or another medium. THE ABOVE CONTENT IS SUBJECT TO OUR TERMS AND CONDITIONS AND PRIVACY POLICY . THIS CONTENT IS PROVIDED FOR INFORMATIONAL PURPOSES ONLY AND DOES NOT CONSITUTE FINANCIAL, INVESTMENT, TAX OR LEGAL ADVICE OR A RECOMMENDATION TO BUY ANY SECURITY OR OTHER FINANCIAL ASSET. THE CONTENT IS GENERAL IN NATURE AND DOES NOT REFLECT ANY INDIVIDUAL’S UNIQUE PERSONAL CIRCUMSTANCES. THE ABOVE CONTENT MIGHT NOT BE SUITABLE FOR YOUR PARTICULAR CIRCUMSTANCES. BEFORE MAKING ANY FINANCIAL DECISIONS, YOU SHOULD STRONGLY CONSIDER SEEKING ADVICE FROM YOUR OWN FINANCIAL OR INVESTMENT ADVISOR. Click here for the full disclaimer.