Imagine a series of four polymers are injected separately into the same SEC column, at

the same concentration in THF$,$ and that each has $M=200,000$ and is narrowly distrib$-$

uted. Prepare two schematic plots of the chromatograms you would expect to see, using

$($a$)$ an RI detector and $($b$)$ an LS detector. You can represent each elution curve as an isos$-$

celes triangle with constant aspect ratio. The important issues are the relative positions

of the peaks along the elution volume axis, and the relative heights $($and therefore areas$)$

of the peaks.