10.1594/PANGAEA.965927Birlo, StellaStellaBirlo0000-0003-0174-4901Wienhues, GiuliaGiuliaWienhues0000-0002-4282-488XZahajská, PetraPetraZahajská0000-0001-5858-0616Grosjean, MartinMartinGrosjean0000-0002-3553-8842García, María LujánMaría LujánGarcía0000-0002-2658-2753Zolitschka, BerndBerndZolitschka0000-0001-8256-0420PANGAEA2024EifelHolzmaarHSIPigmentsXRFCore section labelSection positionDepth, compositeCalendar age, meanCalendar age, minimum/youngCalendar age, maximum/oldRelative absorption band depth, 620 nmRelative absorption band depth, 671 nmRelative absorption band depth, 845 nmChloropigments, per unit sediment massBacteriopheopigments, per unit sediment massPiston corer, UWITECCalculated, based on VT22 (Birlo et al., 2023)MeasuredHSI index, calibrated2019-08-11T00:00:00/2019-08-17T00:00:00Dataset10.1177/095968362412750081415832 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalHyperspectral image (HSI) scanning of the composite record from Holzmaar (HZM19) was measured using a Specim PFD-CL-65-V10 E line scan camera (University of Bern, Switzerland). Data were processed using the ENVI software following the workflow of Butz et al. (2015, doi10.1117/1.JRS.9.096031): data were white-corrected, masked for cracks in the sediment surface and Relative Absorption Band Depths (RABDs) were computed for 2mm wide subsets. RABD671 (band depths from 640 to 702 nm) for Total Chloropigments-a (TChl-a), RABD845 (790 - 900 nm) for Bacteriopheopigments-a (Bphe-a), and RABD620 (600 - 640 nm) for Phycocyanin (PhyCy). To translate HSI indices into absolute concentrations, a pigment extraction was performed at the University of Bern using 23 samples covering the full range of RABD671 and RABD845 index values. Ca 1 g of wet sediment was treated with 100 % acetone following the method of Lami et al. (1994, doi:10.1007/BF00684032) and extractions were measured using a Shimadzu UV-1800 spectrophotometer to obtain bulk concentrations of TChl-a and Bphe-a in µg/g dry sediment using a molar extinction coefficient for TChl-a and Bphe-a. A proxy-proxy calibration was carried out using an ordinary least square regression. After all, only 1.42 % and 0.77 % of datapoints are outside of the calibration ranges for Chl-a (calibration range: 12.75 – 1202.68 µg/g, intercept = -4799.52, slope= 4756,45, r² = 0.8, p-val = 0.00, RMSEP 10-fold = 169.03, RMSEP % = 14.05) and Bphe-a (calibration range 0.38 – 345.12 µg/g, intercept = -1295,8, slope= 1319,7, r² = 0.94, p-val = 0.00, RMSEP 10-fold = 25.26, RMSEP % = 7.32). Ages refer to Birlo et al. (2023) and the related dataset is Model D available via doi:10.1594/PANGAEA.949292.6.88333350.11667Holzmaar, West-Eifel Volcanic Field, Germany