data for Fig 6 The data set consists of single measurements (XXXXX) from a portable COMPASS device (V1). dataXXXXX_FTabs.dbl dataXXXXX_signal.dbl The _signal data consists of time data of a single period (f=20kHz), the _FTabs data consists of Fourier transformed information. For each harmonic (YY=1st to 11th), a data set if provided consisting of the phase of the Fourier transformed single data sets. data_YYharm.dbl *propritary *.dbl file format: binary file filled with double values: data-size = (data-length div 8 Bytes) Measurement of a low concentration (1:500000) of SARS-CoV-2 antibodies to MNP-APTES-S1. ******************************** 6x( 5x ref + 5x S+ + 5x S- )