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 Set of data analysis routines for surface vibrational spectroscopy based on a Delta05 spectrometer with software from VSI or SPECS. 
 
 Simple data reading and plotting routines are provided, but also advanced routines for in depth analysis.
-A fast data browser as graphical user interface is included as **ViewHREELS.py**. It can also take command line arguments.
+A fast data browser as graphical user interface is included as **ViewHREELS.py**. It can also take command line arguments. If a particular backend for matplotlib is needed (like on macOS), it can be passed on the command line like this:
 
-Additional a python interface to a Fortran-based calculation of full HREEL spectra is provided in **class lambin** (in **calcHREELS20.py**). Note that this part requires a local compilation (via "f2py3 -c -m myEels20 myEels20.f90") from the Fortran90 files. Only for the Linux-based python version 3.8, there are complied files provided. For details see below.
+	>: MPLBACKEND=Qt5Agg python3.12 ViewHREELS.py
+
+Additional a python interface to a Fortran-based calculation of full HREEL spectra is provided in **class lambin** (in **calcHREELS20.py**). Note that this part requires a local compilation (via "f2py3 -c -m myEels20 myEels20.f90") from the Fortran90 files. Only for the Linux-based python version 3.8, there are compiled files provided. For details see below.
 
 Most of the routines are within the **class HREELS** (HREELS.py). A simple command line program is "showHREELS.py", which reads one data file and plots the spectrum with a second amplified trace.