  Recently, we developed the Correlation-Aided Reconstruction (CORAR) method to
reconstruct solar wind inhomogeneous structures, or transients, using dual-view
white-light images (Li et al. 2020; Li et al. 2018). This method is proved to
be useful for studying the morphological and dynamical properties of transients
like blobs and coronal mass ejection (CME), but the accuracy of reconstruction
may be affected by the separation angle between the two spacecraft (Lyu et al.
2020). Based on the dual-view CME events from the Heliospheric Imager CME Join
Catalogue (HIJoinCAT) in the HELCATS (Heliospheric Cataloguing, Analysis and
Techniques Service) project, we study the quality of the CME reconstruction by
the CORAR method under different STEREO stereoscopic angles. We find that when
the separation angle of spacecraft is around 150{\deg}, most CME events can be
well reconstructed. If the collinear effect is considered, the optimal
separation angle should locate between 120{\deg} and 150{\deg}. Compared with
the CME direction given in the Heliospheric Imager Geometrical Catalogue
(HIGeoCAT) from HELCATS, the CME parameters obtained by the CORAR method are
reasonable. However, the CORAR-obtained directions have deviations towards the
meridian plane in longitude, and towards the equatorial plane in latitude. An
empirical formula is proposed to correct these deviations. This study provides
the basis for the spacecraft configuration of our recently proposed Solar Ring
mission concept (Wang et al. 2020b).
