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# Sample transformation section for the Porter UBVRI system
transformation
fit u1=0.0, u2=0.65, u3=0.000
const u4=0.0
UFIT : mU = (UB + BV + V) + u1 + u2 * XU + u3 * UB + u4 * UB * XU
fit b1=0.0, b2=0.35, b3=0.000
const b4=0.0
BFIT : mB = (BV + V) + b1 + b2 * XB + b3 * BV + b4 * BV * XB
fit v1=0.0, v2=0.17, v3=0.000
const v4=0.0
VFIT : mV = V + v1 + v2 * XV + v3 * BV + v4 * BV * XV
fit r1=0.0, r2=0.08, r3=0.000
const r4=0.0
RFIT : mR = (V - VR) + r1 + r2 * XR + r3 * VR + r4 * VR * XR
fit i1=0.0, i2=0.03, i3=0.000
const i4=0.0
IFIT : mI = (V - VR - RI) + i1 + i2 * XI + i3 * RI + i4 * RI * XI
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