Added "lattice" package for change the last plot using such package
Moved the note from the bottom
-Added "scales" packaged as a required package
-Changed the figure2 with a ggplot's plot alternative
-Added code for the last plot using "lattice" package
-Added scales and formatted the X axis labels for the last plot
-Changed some plot's titles

Finished version 1, revision 1.
Changed REAME's note; added scales and lattice packages as required packages
Changed the plot2 and plot4