User-suplied inputs:
Column B        Concentrations of the standards (x)
Column C	Instrument readings  of the standards (y)
Column J	Instrument Readings of the unknowns (InstrumentReading)

Calculated outputs:
Cell B28	n=number of x,y data points								
Cell B27	sumx=Σx								
Cell C27	sumy=Σy								
Cell D27	sumxy=Σ(x*y)								 
Cell E27	sumx2=Σ(x*x)								 
Cell F27	sumx3=Σ(x^3)								
Cell G27	sumx3=Σ(x^4)								
Cell H27	sumx2y=Σ((x^2)*y)													
Cell B30	D=n*sumx2*sumx4+2*sumx*sumx2*sumx3-sumx2^3-sumx^2*sumx4-n*sumx3^2								
Cell B31	a=(n*sumx2*sumx2y+sumx*sumx3*sumy+sumx*sumx2*sumxy-sumx2^2*sumy-sumx^2*sumx2y-n*sumx3*sumxy)/D								
Cell B32	b=(n*sumx4*sumxy+sumx*sumx2*sumx2y+sumx2*sumx3*sumy-sumx2^2*sumxy-sumx*sumx4*sumy-n*sumx3*sumx2y)/D								
Cell B33	c=(sumx2*sumx4*sumy+sumx2*sumx3*sumxy+sumx*sumx3*sumx2y-sumx2^2*sumx2y-sumx*sumx4*sumxy-sumx3^2*sumy)/D								
	        ypred=a*x^2+b*x+c
Cell E29	ssy=Σ(y-meany))								
Cell F29	ssr=Σ(y-ypred^2)								
Cell H29	R2=1-(ssr/ssy)									

Column K	Calculated concentration = (-b+SQRT(b*b-4*a*(c-InstrumentReading)))/(2*a)