81.   But as the military services began to consider what they would actually close, they dropped hints to Perry that their original estimates were overly ambitious.

82.   But auto industry analysts say those estimates are too pessimistic.

83.   But Cerf insisted that this estimate was far too low.

84.   But energy experts inside the department and outside acknowledge that all the estimates may be significantly off.

85.   But EPA officials said the new estimate is more sophisticated than past efforts, partly because they included a skeptic of global warming in the study team.

86.   But his estimates were impossible to verify.

87.   But even binding estimates are not ironclad.

88.   But it will be more than two years before anyone finds out whether the estimate is right.

89.   But its early estimates are that natural gas prices for consumers in October and November were significantly below the prices a year ago.

90.   But Ms. Vale says that estimate is too low.