8-Point Quadratic Smooth with FPP-12

This document provides documentation for the '8-Point Quadratic Smooth with FPP-12' program (DECUS NO. 12-73). The program is designed for the PDP-12 computer to smooth large arrays of data (4095 points) using an 8-point quadratic least-squares fit, leveraging the FPP-12 floating-point processor for faster execution compared to software-based methods. Key features include user-selectable filtering by force-fitting the middle 2, 4, or 6 points of the 8-point array. The document details the mathematical derivation, performance improvements over previous 4-point smoothing, program usage, load procedures via DIAL, and provides a flow diagram and system index.