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Fig 1.

Oo—E for means.

(a) overall (b) detail.

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Fig 1 Expand

Fig 2.

Oo—E for medians.

(a) overall (b) detail.

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Fig 2 Expand

Fig 3.

Oo—E for equivalents.

(a) overall (b) detail.

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Fig 3 Expand

Fig 4.

U-M citation curve, 1975–2013.

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Fig 4 Expand