checkCIF procedure

PLAT019

 The reported value of '_diffrn_measured_fraction_theta_full' is less than
 the reported value of '_diffrn_measured_fraction_theta_max'. Their ratio is  
 reported when less than 1.0. When theta_full is less than theta_max such   
 a value indicates that there are relatively more reflections missing at
 lower resolution.
 The measured fraction (completeness) is expected to be higher at a lower
 theta_full value.
 Usually, a theta_full value corresponding to sin(theta)/lambda = 0.6 Ang**-1
 should give a satisfactory data completeness value.
 CIF Dataname Definitions:
 _diffrn_measured_fraction_theta_max:
    Fraction of unique (symmetry-independent) reflections measured out to
    '_diffrn_reflns_theta_max'.
 _diffrn_measured_fraction_theta_full:
    Fraction of unique (symmetry-independent) reflections measured out to
    '_diffrn_reflns_theta_full'.
 _diffrn_reflns_theta_max:
   Maximum theta angle in degrees for the measured intensities. The fraction
   of unique reflections measured out to this angle is given by
   '_diffrn_measured_fraction_theta_max'.
 _diffrn_reflns_theta_full:
    The theta angle (in degrees) at which the measured reflection count is
    close to complete. The fraction of unique reflections measured out to
    this angle is given by '_diffrn_measured_fraction_theta_full'.