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Using data from the Far Infra-Red Survey (FIRS) and a new statistical measure, a contour plot of the likelihood for cosmological models for which $-1 < n < 3$ and $0 \\le Q \\le 50~\\mu{\\rm K}$ is obtained. We find that the likelihood is maximum at $(n, Q) = (1.0, 19 uK)$. 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