Readme to the data published in:
T. Sankowsky-Rothe, H. Schepker, S. Doclo, M. Blau, "Reciprocal measurement of 
acoustic feedback paths in hearing aids" JASA 138 (4), pp. EL399--EL404, 2015 

The file "data_JASAEL_reciprocal_fbp_measurement.mat" contains all the relevant
data of feedback path measurements in Matlab file format.

In particular the following variables are included in the file:

vF					frequency vector
cCombination		cell string with the investigated combinations of venting 
					and ear canal geometries
cMeasurementNames	cell string with the investigated measurement procedures 
					(direct front, direct rear, reciprocal rear)
mFBPath_FF			4-D-matrix with the measured feedback paths (frequency 
					domain) for the free-field condition, the 1st dimension 
					corresponds to the frequency  vector, the 2nd dimension 
					corresponds to the different combinations (venting and ear 
					canal geometries), the 3rd dimension corresponds to the 
					measurement procedure (direct front, direct rear, 
					reciprocal rear), and the 4th dimension corresponds to the 
					repetition
mFBPath_Wall		3-D-matrix with the measured feedback paths (frequency 
					domain) for the wall condition, the 1st dimension 
					corresponds to the frequency  vector, the 2nd dimension 
					corresponds to the different combinations (venting and ear 
					canal geometries), and the 3rd dimension corresponds to the
					measurement procedure (direct front, direct rear, 
					reciprocal rear)
mFBPath_PhoneNear	3-D-matrix with the measured feedback paths (frequency 
					domain) for the near phone condition, the 1st dimension 
					corresponds to the frequency  vector, the 2nd dimension 
					corresponds to the different combinations (venting and ear 
					canal geometries), and the 3rd dimension corresponds to the
					measurement procedure (direct front, direct rear, 
					reciprocal rear)
mFBPath_PhoneMid	3-D-matrix with the measured feedback paths (frequency 
					domain) for the medium phone condition, the 1st dimension 
					corresponds to the frequency  vector, the 2nd dimension 
					corresponds to the different combinations (venting and ear 
					canal geometries), and the 3rd dimension corresponds to the
					measurement procedure (direct front, direct rear, 
					reciprocal rear)
mFBPath_PhoneFar	3-D-matrix with the measured feedback paths (frequency 
					domain) for the far phone condition, the 1st dimension 
					corresponds to the frequency  vector, the 2nd dimension 
					corresponds to the different combinations (venting and ear 
					canal geometries), and the 3rd dimension corresponds to the
					measurement procedure (direct front, direct rear, 
					reciprocal rear)
fs		sampling frequency