How to create symbol with size and color based on two variables in ArcMap?

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In arcmap 10.2

i have a layer that has two attributes: depth and magnitude.

Depth should be represented by color: deeper points being lighter and shallower being darker.

Magnitude represented by symbol's size: points with a higher magnitude have a bigger symbol and points with a lower magnitude have a smaller one.

How do i do that?

So, many people has told me to use "multiple attributes" in the symbology dialog. I wish i could upload a screenshot but my firewall seems to have the image service blocked. Let's try with words.

1. "Multiple attributes" offer these input boxes: "value fields" and "variation by".
2. in "value fields" i select "depth" and "magnitude"
3. in "variation by" we have two buttons: "color ramp" and "symbol size"
4. in "color ramp" i choose "depth"
5. i open "symbol size". There, "depth" is selected. I change it to be "magnitude".
6. open "color ramp" again. No longer "depth" is selected. Now "magnitude" is.

Basically, whenever i select something on "symbol size" or "color ramp", the same selection is duplicated on the other button.



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