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Interpolation is a program that calculates many kinds of interpolation.
It calculates liner fit, power fit, logarithmic fit, lagrange fit, least square
of second degree, least squares of third degree and also shows
examples of plots of these functions.

Screenshot of Interpolation

1- transfer the program to the HP48
2- press the softkey for INTERPOLATION, in the menu
3- type 0 STO
4- turn off the calculator
5- turn on the calculator
6- press RIGHT SHIFT and LIBRARY and INTER to access the program