The method of analysis of 2DC data is described in the article cited above. Briefly, the entire-in technique is used where the only crystals counted are those that do not extend to the boundary of the diode array. The maximum dimension of the crystal is determined from the largest of the the crystal dimension along or perpendicular to the diode array. The size range of the 2DC probe used on the Citation aircraft was 66-1000 microns. The crystal projected area is determined directly from the number of diodes occluded.
Crystal mass is estimated from use of the mass dimension relation cited in the above reference.
The replicator provides detailed habit information about crystals. The replicator covers the size range below 66 microns where the 2DC does not respond. Reduncy is vital in field projects where failure of a probe can be very costly and very annoying. 2DC data analysis provides some idea of crystal image, though at low resolution. 2DC data analysis is very rapid in comparison to the replicator analysis, and can essentially be performed in real time.