PRISM secondary screen?

[mschubert]

According to the DepMap PRISM repurposing page:

The primary PRISM Repurposing dataset contains the results of pooled-cell line chemical-perturbation viability screens for 4,518 compounds screened against 578 or 562 cell lines.

The secondary PRISM Repurposing dataset contains the results of pooled-cell line chemical-perturbation viability screens for 1,448 compounds screened against 499 cell lines in a 8-step, 4-fold dilution, starting from 10μM.

However, when I look at the drug sensitivity function, it only mentions the primary screen.

Is there a reason the secondary screen is not included in this package?