Tata Consultancy Services reported quarterly earnings yesterday that show India's biggest IT services company is still seeing strong demand for its services with an order book of more than $8 billion garnered during its fiscal second quarter. The rate of growth, however, seems to have moderated, with the more than 600,000-strong company growing at less than half the pace at which it grew last year from one quarter to the next. Shares were little changed in early Mumbai trading