You can use the CacheControl object to pull L1 market data from REDI's back-end. The list of available fields is in Appendix A REDI Data Fields in the REDI API Specification.
However, I couldn't find the "Indicative Opening Auction Price" and "Indicative Opening Auction Volume" in the list.
The following code demonstrates how to pull bid price for IBM.
CacheControl orderCache = new CacheControl();object BidPrice = null;object exec_err = null;orderCache.Submit("L1", "true", ref exec_err);orderCache.GetL1Value("IBM", "Bid", ref BidPrice);Console.WriteLine(BidPrice.ToString());
Can you pull the "Indicative Opening Auction Price" and "Indicative Opening Auction Volume" from the REDIPlus UI?