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How to interpret a heat map?

The GigaTrader heatmap displays how a set of symbols is moving in relation to the open market price. 
Symbols are taken from a watchlist, and their price movement is represented as a color-coded tile. The size of the tile corresponds to the market capitalization (Stocks) or volume (Futures), and the color depends on the direction of the price change from the mark price during the day.

Here is what is displayed at a glance:
• The tile displays Symbol, Instruments description, Last price, Change, % (see details 
below), Market capitalization (for Stock) or Volume (for Futures).
• The size of the tiles with symbols corresponds to the current market cap of the issuing 
company. The larger the tile, the bigger the company's market cap. For Futures, the size 
is based on the previous day traded volume for all futures contracts for the product.
• The tiles are color-coded depending on the direction of the price change (in percentage) 
during the day. The price change percentage (Change%) is calculated using the formula:
Change% = (Last price - previous Day Close Price) * 100%/previous Day Close Price
Symbols with positive Change% are displayed on green tiles. Symbols with negative Change % are displayed on red tiles

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