Revert "Deleting plot4.png"

This reverts commit df53573834243b3b641f13402a5697f67dd47f93.
Revert "Deleting plot3.png"

This reverts commit c076bf10a92e5017e83418efedab24c4674b11ea.
Revert "Deleting plot1.png"

This reverts commit ffb9b883e0335d1e8ca4fc729b2e51a2874dc802.
Revert "Deleting plot2.png"

This reverts commit e15dd7f807c5138f0acfb57310eb6e03af0b44f4.