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Forex tick chart
Tick chart has the finest scale with 1 tick (individual quoting of bid and ask prices by market-maker). It is the chart of bid and ask quotations, which look like columns on the price chart.
The maximum of each separate column is Ask; the minimum of each concrete column is Bid.
As a rule, a tick chart is not used for the analysis of the market because its scale is too small to approach the technical analysis. However, tick charts are effectively used for exact definition of support and resistance levels as well as to raise efficiency of purchases and sales, making it on local minima and maxima.