ed particle height in mm</td></tr><tr><td><strong>height_obs</strong></td><td><code>numeric</code></td><td>Observed particle height in mm. Height was only measured for large particles</td></tr><tr><td><strong>category</strong></td><td><code>factor</code></td><td>Particle category based on visual inspection</td></tr><tr><td><strong>poly_type</strong></td><td><code>factor</code></td><td>Polymer type as determined by near infrared spectroscopy (NIR)</td></tr><tr><td><strong>two_dim</strong></td><td><code>logic