41.   Different versions of the crystal had to be made for comparison, each with a different heavy metal in the lattice to provide reference points.

42.   Drivers and crew members cited a long list of crashes as reference points, trying to reason through what Petty experienced.

43.   Elements from the Nick Jr. cable program such as Face and the Little Big Room give children some familiar reference points in the game.

44.   Each map specifies the location of several thousand genetic markers along the DNA molecule that serve as reference points for finding genes known to lie between those points.

45.   Even psychologists, who are more comfortable with survey data, say that the lack of a fixed reference point creates problems.

46.   Even the cultural reference points have changed.

47.   For him, it serves as a reference point.

48.   For me he was a reference point more than a broadcaster.

49.   For stocks, the best reference point might be how other stocks in the same industry have performed.

50.   Frank Callahan is a star, a reference point.