1. Introduction

SPIERSedit is a package for editing (i.e. preparing) tomographic (slice-based) datasets from any source, for example serial grinding, serial sectioning, or computed tomography, and exporting them as three-dimensional models. It is the core part of the SPIERS package, which includes two other separately documented programs, SPIERSalign (used to prepare data for SPIERSedit) and SPIERSview (used to view and manipulate the 3D models SPIERSedit produces).