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Table 2 Constants of second order polynomials obtained from the regression of the experimental data for moisture-related swelling of parchment specimens—larger responses are only considered

From: Risk of climate-induced damage in historic parchment

Code (see Table 1)

A1

A2

C

12.43

− 6.19

H1

9.33

− 2.33

H2

10.80

− 4.77

H3

9.96

− 3.93

H4

9.60

− 2.47

H5

4.16

1.44

H6

11.24

− 3.92

H7

8.99

− 3.10

  1. The equation used was MRS = A1·RH + A2·RH2 where MRS is the moisture related strain in percent and RH—relative humidity in percent. MRS is expressed as the change in length divided by the specimen length at dry conditions (RH = 0), therefore the intercept of the polynomial function is zero