"Key positions in the civil service are typically director-level jobs where the officer holds the entry-level superscale grade of MX9 or it's equivalent. The mid-point of the MX9 salary scale is about $13,750 per month."
- ST, Feb 23, 2013

So ST confirms this again today.

Also of note is that only 1 in 83 civil servants are in MX9, as mentioned in an earlier post in this super long thread. There are 77,000 civil servants in total.