[math-font-discuss] Bold lines

[Smrčková Lucie]

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 Hello, 
I have some math expresses (fractions), eqnarrays, tabulars with fractions and after conversion to ps (-> pdf), most of the fraction lines and tabular lines (hline) became bold. What is weird, not all the lines. Colud someone please help me?
The preamble is
\documentclass[11pt,a4paper,czech, UKenglish]{report}\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{fancyhdr}
\usepackage{booktabs}
\usepackage{multirow}
\usepackage{bigstrut}
\usepackage[dvips]{graphicx}
\usepackage{pstcol}
\usepackage{pstricks,pst-node, pst-tree}
\usepackage{babel,varioref}
\usepackage[T1]{fontenc}
\usepackage[cp1250]{inputenc} 
Thanks. Lucie