Restore a lost partition from degraded software mirror RAID I used to store my valuable files on Apple software RAID (mirror). Recently one disk has failed and the mirror became degraded.

I rebuilt the mirror using new drive, following this guide, but seems like there are no partitions on it.

I believe the data on the healthy drive is not corrupted. What programs should I use at this point to retrieve if not the lost partition, but data?
You can try the following programs to retrieve your data from lost/damaged partitions: FileSalvage, Data Rescue, Stellar Phoenix Mac Data Recovery, DiskWarrior. The good practice is to create an image of the actual partition and restore data from it.