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SSASIM output file .PFP

 --- .PFP file contains PIA formula parameters for each year
          of each scenario.
 
 "scen   ", // ( 1) simulation scenario [1,RUN.scenarios]
 "year   ", // ( 2) calendar year [RUN.year_zero,final_year]
            //      where final_year = COHORT.birth_year + 134
 PIA-formula bendpoints (bpt) which are same for all eligibility events:
 note 1st PIA-formula fraction applies to earnings below bottom bpt
 "bendpt1", // ( 3) bottom PIA-formula bendpoint in dollars
 note 2nd PIA-formula fraction applies to earnings in bottom-middle bpt range
 "bendpt2", // ( 4) middle PIA-formula bendpoint in dollars
 note 3rd PIA-formula fraction applies to earnings in middle-top bpt range
 "bendpt3", // ( 5) top PIA-formula bendpoint in dollars
 note 4th PIA-formula fraction applies to earnings above top bpt
 PIA-formula fractions for retirement eligibility event:
 "ff1_oai", // ( 6) 1st PIA-formula fraction for OAI in percent
 "ff2_oai", // ( 7) 2nd PIA-formula fraction for OAI in percent
 "ff3_oai", // ( 8) 3rd PIA-formula fraction for OAI in percent
 "ff4_oai", // ( 9) 4th PIA-formula fraction for OAI in percent
 PIA-formula fractions for death eligibility event:
 "ff1_si ", // (10) 1st PIA-formula fraction for SI in percent
 "ff2_si ", // (11) 2nd PIA-formula fraction for SI in percent
 "ff3_si ", // (12) 3rd PIA-formula fraction for SI in percent
 "ff4_si ", // (13) 4th PIA-formula fraction for SI in percent
 PIA-formula fractions for disability eligibility event:
 "ff1_di ", // (14) 1st PIA-formula fraction for DI in percent
 "ff2_di ", // (15) 2nd PIA-formula fraction for DI in percent
 "ff3_di ", // (16) 3rd PIA-formula fraction for DI in percent
 "ff4_di "  // (17) 4th PIA-formula fraction for DI in percent