The first chart shows the price action over the past three days, beginning with Friday's big decline. With yesterday's and today's (Tuesday's) combined bounce, the INDU and SPX have closed higher than Friday's open, while the NDX and RUT are still below.
The NDX was the weakest on the two-day bounce, perhaps because of AAPL's relative weakness, which is reflected in this year-to-date Daily ratio chart comparing AAPL to the NDX (the Momentum Indicator is still below zero as price struggles below resistance)...also, two important ones to watch for either a strengthening or for further relative weakness, which could lead to the resumption of a decline in both.