How to separate the pull request into two different ones

git_steps_to_separate_pr

# From the master branch I create one to test Steve pull request
git checkout -b steve
# I fetch all that ehsteve has in his branch
git remote add 
git fetch -v ehsteve
# Merge Steve pull request with master
git pull ehsteve master
# Run the tests
py.test sunpy
#!!! 3 of them fails!
# sunpy/tests/spectra/test_spectrogram.py FFF..................................

# See the different files between the two branches
git diff --name-status master..steve
#M       doc/source/guide/index.rst
#A       doc/source/guide/plotting.rst
#A       sunpy/data/examples/flare_spectrum.txt
#M       sunpy/io/__init__.py
#M       sunpy/map/map.py
#M       sunpy/map/sources/soho.py
#A       sunpy/map/util.py
#M       sunpy/spectra/spectrogram.py
#M       sunpy/spectra/spectrum.py
#A       sunpy/sun/examples.py
#M       sunpy/wcs/wcs.py

#change to the master branch
git checkout master
#create a new branch with just the separate pull request
git checkout -b stevenew
#checkout just these files that we want...
git checkout steve doc/source/guide/plotting.rst doc/source/guide/index.rst
#Check the status to be sure we are doing the right thing
git status
#Commit changes
git commit -m 'merge files we wanted with a better plotting guide'
#push the changes to my repository
git push -u origin stevenew