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import shelve
import string
import time


class MeasurementDB(object):
    r"""Database for storing measurements, with export to LaTeX macros.

    Example usage:

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def pdf_probabilities(xs, dependents, yields, pdfs):
    """Return an array of normalised PDF probabilities.

    For a list of N yields, each y_i, and a list of N PDFs f_i, the probability
    for the ith PDF at the (possibly vector) point x is defined as

        p_{i} = \frac{N_{i}f_{i}}{\sum_{i}^{N} N_{i}f_{i}}

    Keyword arguments:
    xs -- List of values at which to evaluate the PDFs

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# Name of the delta mass variable in the workspace
dmass_var = 'Dst_delta_M'
# Species of the PDF we're about to build
species = 'sig'
workspace.factory('mu_dm_{0}[141, 146]'.format(species))
workspace.factory('sigma_one_dm_{0}[1, 0, 5]'.format(species))
workspace.factory('nsigma_two_dm_{0}[1.5, 1, 3]'.format(species))
workspace.factory('nsigma_three_dm_{0}[1.5, 1, 3]'.format(species))
workspace.factory((
    'expr::sigma_two_dm_{0}('

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