Additional detail of current wave structure in base case S&P bull market. Grey box between 1884-1729 reflects retracement targets for wave circle 4 based on the total length from points circle 2 - circle 3. Additional grey box between 2511-2667 reflects a slightly tighter target region for wave circle 5 of wave III. Note confluence near 400% extension of waves circle 1-2 and 276.4% extension of waves I-II (@ SPX 2511-2539).