Determines whether the colorscale is a default palette (`autocolorscale: true`) or the palette determined by `colorscale`. In case `colorscale` is unspecified or `autocolorscale` is true, the default  palette will be chosen according to whether numbers in the `color` array are all positive, all negative or mixed.

Reverses the color mapping if true. If true, `zmin` will correspond to the last color in the array and `zmax` will correspond to the first color.

Determines whether or not a colorbar is displayed for this trace.

Sets the source reference on Chart Studio Cloud for  z .

The sample data from which statistics are computed is set in `x` for vertically spanning histograms and in `y` for horizontally spanning histograms. Binning options are set `xbins` and `ybins` respectively if no aggregation data is provided.

Sets the sample data to be binned on the x axis.

Sets the sample data to be binned on the y axis.

Sets hover text elements associated with each bar. If a single string, the same string appears over all bars. If an array of string, the items are mapped in order to the this trace's coordinates.

Specifies the binning function used for this histogram trace. If *count*, the histogram values are computed by counting the number of values lying inside each bin. If *sum*, *avg*, *min*, *max*, the histogram values are computed using the sum, the average, the minimum or the maximum of the values lying inside each bin respectively.

Specifies the type of normalization used for this histogram trace. If **, the span of each bar corresponds to the number of occurrences (i.e. the number of data points lying inside the bins). If *percent* / *probability*, the span of each bar corresponds to the percentage / fraction of occurrences with respect to the total number of sample points (here, the sum of all bin HEIGHTS equals 100% / 1). If *density*, the span of each bar corresponds to the number of occurrences in a bin divided by the size of the bin interval (here, the sum of all bin AREAS equals the total number of sample points). If *probability density*, the area of each bar corresponds to the probability that an event will fall into the corresponding bin (here, the sum of all bin AREAS equals 1).