**Expression Charts**An expression or spread chart is constructed using one or more contracts, numerical constants and simple mathematical operators (+-*/). All Expression or spreads must begin with an equal sign (

**=**).

All Special Symbols (Preferreds, Warrants, Units, etc), Futures, Index or Options Symbols must be enclosed with a single quotation marks ( ' ) at the beginning and the end of the symbol. Example:

**'**CL H2

**'**,

**'**JPM/PB

**'**,

**'**BAC/WA

**'**,

**'**$INDU

**'**

Expressions are calculated from left to right using Standard Mathematical order. Use parentheses to change the order of the calculations, numerical constant and mathematical operator.

here are some example:

=ibm-msft

='$spx' - 'sp m2'

=’rim-tc’ – rimm

=((ibm-msft) / '$indu'))

=’bac/pc’ – bac

contracts used in an expression can be the explicit contract ('sp h2', 'us m2005', etc.), a nearby contract ('sp 1!', 'us 1!', etc.) or a forward contract ('sp 3!', 'us 3!', etc.).

=(('cl h2'+'clj2'+'cl k2')/3)

=(‘cl 1!’ + ‘cl 2!’ + ‘cl 3!’) /3

=('xrb 1!' * 28 +'ho 1!' * 14) - 'cl 1!'

when using expressions in a watchlist or chart, you can specify the price field that is used (if omitted, last is default). this is done by using the dot (.) operator.

=msft.low / csco.low

=goog.low / 'rim-tc'.high

.****note** chartable expressions do not display the open, high, low, close, and change fields in the chart's header, they simply display the result of the expression.**

**Certain studies are also unavailable on expression charts**