tr_bill_rate            Daily treasury bill rates
tr_cache_dir            Get or manage the treasury API cache
tr_curve_rate           Download Treasury Coupon Issues and Corporate
                        Bond Yield Curves
tr_long_term_rate       Daily treasury long-term rates
tr_real_long_term       Daily treasury real long-term rate averages
tr_real_yield_curve     Daily treasury par real yield curve rates
tr_yield_curve          Daily treasury par yield curve rates
