| Parameter Name | Units | Type | Default | Description |
| FILENAME | STRING | filename for histogram output | ||
| INTERVAL | long | 1 | interval in passes between output | |
| START_PASS | long | 0 |
starting pass for output | |
| BINS | long | 50 | number of bins | |
| FIXED_BIN_SIZE | long | 0 |
if nonzero, bin size is fixed at given value | |
| X_DATA | long | 1 | histogram x and x'? | |
| Y_DATA | long | 1 | histogram y and y'? | |
| LONGIT_DATA | long | 1 | histogram t and p? | |
| BIN_SIZE_FACTOR | double | 1 | multiply computed bin size by this factor before histogramming |