Etna, 2001 eruption

number of samples used: 27;
size analysis technique: sieving down to 63 micron;
method used for data integration: Voronoi;
unit used: phi = -log2d (d is the particle diameter in mm).

diam.
(phi)	wt%
-3	0
-2	0.5
-1	2.5
0	5
1	16.5
2	42.5
3	27.5
4	5
>4	0.5