Are you a savvy reader of charts? If yes, then you likely noticed the beautiful way in which Endurance International Group’s (EIGI) RS line has vaulted into new high ground, in conjunction with its breakout past a 20.55 flat-base buy point. What is the Relative Strength line? It gives you an instant look at whether a stock is outperforming the S&P 500, a principal benchmark of the stock market.