anchor.diff:  
   # install obspy and dependencies via conda
   RUN conda config --add channels obspy && \
  -    conda install --yes jupyter mysql-python obspy && \
  +    conda install --yes jupyter obspy matplotlib && \
       conda clean -i -l -t -y && \
       useradd \
           -c 'Docker image user' \
  
positive.code: 
  # install cdf, spacepy, and magpy
  RUN cd /tmp && \ 
      wget http://cdaweb.gsfc.nasa.gov/pub/software/cdf/dist/cdf36_4/linux/cdf36_4-dist-all.tar.gz && \
      tar zxvf cdf36_4-dist-all.tar.gz && \
      cd cdf36* && \
      make OS=linux ENV=gnu CURSES=yes FORTRAN=no UCOPTIONS=-O2 SHARED=yes all && \
      make INSTALLDIR=/usr/local/cdf install && \
      cd /tmp && \
      pip install spacepy && \
      pip install geomagpy && \
      cd /tmp && \
      rm -rf /tmp/cdf36*
  
  
  USER magpy_user
  
negative.code: FROM debian:buster
  
  MAINTAINER Roman Leonhardt <roman.leonhardt@zamg.ac.at>
  LABEL geomagpy.magpy.version=1.0.5
  
  # update os
  RUN apt-get update --fix-missing && \
  