News and trade ideas Prices above are subject to our website terms and agreements. Prices are indicative only. All share prices are delayed by at least 15 minutes. Sell Buy Change FTSE 100 Wall. At its most fundamental, the basic and intuitive interpretation of this implied data is often the most telling for traders. Taken alone, a steady rise in the longer-term implied volatility (the red line) is indicative of a strengthening trend; while inversely, a decline often reveals that a period of range or consolidation in spot is ahead or already in place. Additionally, the histogram or.