# Function for graphing temperature dependent data
def graphTmpData( keyProp, jsonfilename ):
    # Import required modules
    from matplotlib import pyplot as plt
    import json
    # Open the mks json data file
    with open(jsonfilename, 'rt') as mksfile:
        # Load json data from file
        mksdata = json.load(mksfile)
        # Initialize values
        axes = plt.gca()
        vunits = ""
        tunits = ""
        edx = 0
        # Compile property data
        for entity in mksdata['Entities']:
            for property in entity['Properties']:
                if( property['Property'] == keyProp ):
                    # Initialize data lists
                    xvalues = []
                    yvalues = []
                    # Retrieve property data
                    for datum in property['Data']:
                        # Compile datum values
                        xvalues.append(datum['Temperature'])
                        yvalues.append(datum['Value'])
                    # Assign property units from first datum
                    if( len(property['Data']) > 0 ):
                        datum = property['Data'][0]
                        if( vunits == "" ):
                            vunits = datum['ValueUnits']
                        if( tunits == "" ):
                            tunits = datum['TempUnits']
                    # Plot xy values as scatter plot
                    axes.scatter(xvalues, yvalues, label=entity['Identifier'])
            # Increment entity index
            edx = edx + 1
        # Finalize graph attributes
        axes.grid(True, linestyle='--', color='0.80')
        axes.set_ylabel('Property Value, ' + vunits)
        axes.set_xlabel('Temperature, ' + tunits)
        axes.set_title(keyProp)
        plt.legend(loc=0)
    # Show graph
    plt.show()
    # End graphTmpData
    return