Printer’s errors

This seems to be a printer s error since the mean should be 84.241. 

A printer s error can easily invalidate the n.m.r. data published. For example,... 

For further data, see Refs. 367, 483, and 631. 6 Ref. 435 states syrup, [a]D —88° (E) evidently, an impure sample. c Ref. 775 states syrup, [a]D -33.1° (E), for a product of the alkaline treatment of the p-nitrophenyl glycoside its structure is probably quite different. d Ref. 632 states crystalline, hydroscopic compound, without, however, any m.p. value. e In the original paper,746 the opposite sign (printer s error) appeared (see also, the acetate479,746). r Obtained by sublimation of the lower-melting modification at 85—100°. [a]D —9° was given by mistake. 

Authors should check proofs thoroughly by reading them at least twice. Only corrections and necessary changes can be made in proofs. Extensive changes will require editorial approval and perhaps a revised date of receipt and will delay publication. Printer s errors are corrected at no cost to authors, but authors mav be charged the cost of extensive production work made necessary by their own alterations. In books, there may not be time to do extensive alterations at all. 

A printer s error was probably responsible for this small error in the calculated mean, which should be 80.97. 

In addition to the self-tests, you have another tool for troubleshooting HP laser printers. Error codes are a way for the LaserJet to tell the user (and a service technician) what s wrong. Table 10.5 details some of the most common codes displayed on an HP LaserJet. 

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