Fig. 5

Calculated score as a function of log(t _T /a _T ). Black filled circle shows the change of PC1 score for single treated wood (a, c thermal treatment, b, d hygrothermal treatment). Black solid line shows the master curve. Green circle shows the score calculated by the inner product of duplex heat-treated wood spectra with loading vector for thermal treatment and hygrothermal treatment (a, c Green opened circle show the inner product score of spectra of hygrothermally treated wood followed by the thermal treatment with loading of thermal treatment, green closed circle show the inner product score of spectra of thermally treated wood followed by the hygrothermal treatment with loading of thermal treatment. b, d Green opened circle show the inner product score of spectra of thermally treated wood followed by the hygrothermal treatment with loading of hygrothermal treatment, green closed circle show the inner product score of spectra of hygrothermally treated wood followed by the thermal treatment with loading of hygrothermal treatment.)