Two kind of labelstyle are accepted: 1) A number referring to the existing choices: 0 : Two thin continuous lines, one bold continuous line... 1 : before the middle of levels: thin dash. Then thin continuous line. and bold for the middle 2 : Same as case 1 but threshold value is defined by the user by answering a question 3 : Solid-Bold, solid-thin, dash Dot-thin, solid-thin, Solid-Bold... 4 : Solid-very-thin, except for contour O, that is solid-bold 2) for the labelstyle based on a threshold value (with a style before and after the threshold value and a bold solid line for the value itself, a more general definition can be given with a scalar string with the following structure: 'xxNN...NNyy' with xx and yy correspondind to one the following choices (with the corresponding meaning) so -> Solid do -> Dotted da -> Dashed dd -> Dash Dot ld -> Long Dashes and NN...NN any kind of number that will define the threshold value. for example 'do-6.6so' will do dotted line until -6.6 and solid line after.

Vector containing values of isolignes to be traced.

Used interbally by plt(z)(t) to define c_linestyle when calling pltbase. Vector used to define the isocontour's style.

Used interbally by plt(z)(t) to define c_thick when calling pltbase. Vector used to define the isocontour's thickness.