Federal Retirement Deductions

I worked for the IRS in 2020 for the first time.  They deducted for 2 different retirement plans, marked TSP-FERS & Retirement on my check stubs.  When I received my 2020 W-2, the amount of TSP-FERS shows up in box 12-code D & the same amount is deducted from my gross pay in box 1.

 

I don't see the other retirement amount on my W-2.  The government website says it's a 4.4% deduction for their basic benefit plan.  It looks like it is an annuity but It's hard to find much information. 

 

Is this deductible anywhere?