How to use ds2nfu function to annotate the multiple plots in one figure

I am using Matlab calculate psd of signal (hammer hits at one point). I need to annotate each plot with hit number(i.e. data file name). I tried but being new making mistake while imputing data to function ds2fnu. Please let me know, where I am making mistake. It will be great some one notice more problems in approach of psd also. The signal is impact/transient captured using accelerometer as sensor.

Problem between line 67 to 76. I have included data files in zip to run and see the out.

Thanks in advance. Mahabir Prasad