$2.$ For the Triaxial Compression Strength test $($TCS$)$: $(10$ points$)($attached a portion of the raw data$)$

a$)$ Plot the obtained data for stress $($Sig$\mathrm{.}1)$ versus axial and radial strains and study the elastic behavior of the tested rock. $(2$ points$)($How to plot in excel? steps please$)$

b$)$ What is the triaxial compressive strength $($TCS$)$ of that rock? Note that for this step you need to plot the stress difference $($Sig$\mathrm{.}1$ Sig$\mathrm{.}3)$ versus axial and radial strains. $(2$ points$)$

c$)$ Add to your plot in step $($a$)$ two more stress $$ axial strain curves that would schematically show the expected results of triaxial compression tests run at confining pressures of your choice, but greater than the one used in the lab. Indicate the confining pressure $($Sig$\mathrm{.}3)$ value on each curve and summarize in writing what is the expected effect of confining stress increase on average Young$$s modulus, TCS$,$ and post$-$peak behavior? Note that these curves are rough sketches and no calculation is needed. $(5$ points$)($How on excel? steps please$)$