MSO56B: set up rising/falling slew rate thresholds separate from rise/fall time thresholds

Q1: What are the correct SCPI commands to control the absolute reference thresholds for a rising/falling slew rate measurement in V (e.g. measure slew rate between 5-12V)?

Q2: What are the correct SCPI commands to control the relative reference thresholds for a rise/fall time measurement in % (e.g. measure 10-90% rise/fall time)?

(see attached slew_rate_thresholds.png)

I am trying to set the slew rate measurement thresholds as absolute levels in V, and the rise/fall time measurement thresholds as 10-90%.

I have no problem doing this manually via the scope screen but I would like to automate the configuration of this measurement via SCPI commands.

Thanks!